Campbell v. Natl Railroad Pass ( 2018 )


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  •                    UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF COLUMBIA
    ________________________________
    )
    KENNETH CAMPBELL, et al.,       )
    )
    Plaintiffs,      )
    )
    v.                    ) Civil Action No. 99-2979 (EGS)
    )
    NATIONAL RAILROAD PASSENGER     )
    CORPORATION,                    )
    )
    Defendant.       )
    ________________________________)
    ________________________________
    )
    LORETTA K. BETHEA,              )
    )
    Plaintiff,       )
    )
    v.                    ) Civil Action No. 01-1513 (EGS)
    )
    AMTRAK POLICE DEPARTMENT,       )
    )
    Defendant.       )
    ________________________________)
    MEMORANDUM OPINION
    Plaintiffs — seventy-one African-American current or former
    employees or applicants for employment at defendant National
    Railroad Passenger Corporation (“Amtrak”) — allege that Amtrak
    engaged in racial discrimination in its hiring, promotion, and
    disciplinary practices and created a hostile work environment.
    Plaintiffs bring this lawsuit on behalf of themselves and more
    than 11,000 African-American unionized Amtrak employees, former
    employees, and applicants for employment at Amtrak.
    Pending before the Court are plaintiffs’ motion for class
    certification, Amtrak’s motions to exclude a number of
    plaintiffs’ experts, Amtrak’s motion to strike portions of the
    declarations filed by plaintiffs in support of class
    certification, Amtrak’s motion to strike portions of plaintiffs’
    reply in support of their motion for class certification, and
    Amtrak’s motion for partial summary judgement. As explained more
    fully below, because plaintiffs’ class definitions make
    membership in plaintiffs’ proposed class contingent on
    individualized merits determinations, and because plaintiffs
    have failed to meet their burden to establish that the claims of
    all class members are susceptible to common proof, plaintiffs’
    motion for class certification is DENIED. In addition, Amtrak’s
    motion to exclude Jay Finkelman’s expert report and testimony is
    GRANTED, Amtrak’s motion to exclude Thomas Roth’s expert report
    and testimony is DENIED, Amtrak’s motion to exclude Edwin
    Bradley and Liesl Fox’s expert report and testimony is DENIED,
    Amtrak’s motion to strike portions of plaintiffs’ declarations
    is GRANTED in part, Amtrak’s motion to strike portions of
    plaintiffs’ reply brief is GRANTED in part and DENIED in part,
    and Amtrak’s partial motion for summary judgment is GRANTED.
    In Part I of this opinion, the Court sets forth the
    procedural history of this litigation. Part II sets forth
    factual background regarding Amtrak’s structure, hiring and
    2
    promotions decisions, disciplinary system, and work environment.
    In Parts III and IV, the Court analyzes the admissibility of
    various experts and other evidence offered in support of
    plaintiffs’ motion for class certification. Part V discusses
    whether class certification is warranted in this case and,
    finally, Part VI resolves Amtrak’s partial motion for summary
    judgment on plaintiffs’ disparate-impact claims.
    I.   PROCEDURAL HISTORY
    A.   The Initial And Amended Complaints
    This employment discrimination class-action was filed on
    November 9, 1999 on behalf of current and former African-
    American employees of Amtrak’s Intercity Strategic Business Unit
    or applicants for employment in that unit. Compl., ECF No. 1.
    Plaintiffs alleged claims for violations of the Civil Rights Act
    of 1866, 
    42 U.S.C. § 1981
    , and violations of Title VII of the
    Civil Rights Act of 1964 (“Title VII”), 42 U.S.C. § 2000e,
    against Amtrak and a myriad of labor unions representing certain
    plaintiffs. Id. An amended complaint was filed on March 13,
    2000, adding a number of named plaintiffs and a handful of labor
    unions as defendants. First Am. Compl., ECF No. 30.
    B.   The Court Adjudicates A Series Of Dispositive Motions
    The first round of dispositive motions was filed in May
    2000 in response to the amended complaint. Although a number of
    labor-union defendants answered the amended complaint, a few
    3
    moved to dismiss on the ground that the labor unions were not
    “indispensable parties” to the litigation and would be better
    joined in the liability phase of the lawsuit if plaintiffs
    prevailed on their discrimination claims against Amtrak. See
    Union Defs.’ Mot. to Dismiss, ECF No. 40; Union Defs.’ Mot. to
    Dismiss, ECF No. 48. Amtrak also moved to dismiss plaintiffs’
    class claims, arguing that no amount of discovery would render
    plaintiffs’ proposed classes certifiable under Federal Rule of
    Civil Procedure 23. See Def.’s Mot. to Dismiss, ECF No. 47.
    Amtrak moved separately to dismiss the individual claims of
    plaintiffs on a variety of grounds or, in the alternative, for a
    more definite statement of those claims. See Def.’s Mot. to
    Dismiss, ECF No. 50.
    Shortly after those motions were briefed, plaintiffs moved
    for a temporary restraining order and preliminary injunction in
    order to enjoin Amtrak from “discriminating, disciplining,
    intimidating, or in any other way retaliating” against
    plaintiffs and class members. See Pls.’ Mot. for TRO/PI, ECF No.
    51. The Court denied the request for temporary injunctive relief
    on June 12, 2000. See Order, ECF No. 62. Thereafter, the Court
    granted the motions of the union defendants to be dismissed from
    the case, subject to their being rejoined in the event
    plaintiffs are successful on their liability claims and the
    4
    union defendants are necessary to the finalization of an
    appropriate remedy. See Order, ECF No. 63; Order, ECF No. 64.
    A second amended complaint, filed August 22, 2000, added
    one named plaintiff and eliminated the labor-union defendants.
    See Second Am. Compl., ECF No. 79. On January 26, 2001, the
    Court denied Amtrak’s motion to dismiss plaintiffs’ class
    claims. See Mem. Op. and Order, ECF No. 92. The Court determined
    that dismissal of the class claims was premature given the early
    stage of the proceedings, particularly because additional
    discovery could permit plaintiffs to correct any fatal flaws in
    their class definition. Id. at 3. 1 Later that year, the Court
    denied Amtrak’s motion to dismiss plaintiffs’ individual claims.
    See Campbell v. Amtrak, 
    163 F. Supp. 2d 19
     (D.D.C. 2001). In so
    doing, the Court rejected all four of Amtrak’s arguments for
    dismissal, namely that: “1) certain 
    42 U.S.C. § 1981
     claims are
    barred by the statute of limitations; 2) claims of plaintiffs
    who previously filed a charge involving the same conduct
    complained of here, but failed to sue, are barred by the statute
    of limitations in their right-to-sue letters; 3) certain Title
    VII claims are barred by the statute of limitations; and 4)
    claims which do not allege a timeframe fail to state Title VII
    1    When citing to the electronic filings in this opinion, the
    Court cites to the ECF page numbers, not the page number of the
    filed document.
    5
    claims.” 
    Id. at 21
    . The Court granted in part, however, Amtrak’s
    motion for a more definite statement, ordering “plaintiffs to
    include dates of alleged events, to the extent possible, in an
    amended complaint” and “to amend their pleading to include a
    more appropriate term to define the class, so as to exclude from
    the class definition the salaried managerial and professional
    positions that were included within the scope of the McLaurin
    class action discrimination case against Amtrak.” 
    Id. at 28
    .
    Plaintiffs filed a third amended complaint on January 3,
    2002 to address the concerns set forth in the Court’s dismissal
    Order. See Third Am. Compl., ECF No. 100. On May 27, 2002,
    plaintiffs filed the fourth amended — and currently operative —
    complaint. See Fourth Am. Compl., ECF No. 145. The complaint was
    amended in response to a decision by the parties to merge
    twenty-one discrimination lawsuits filed by current and former
    Amtrak employees in the Eastern District of Louisiana into the
    putative Campbell classes. See Pls.’ Mem. in Supp. of Mot. to
    Amend, ECF No. 143 at 3-4. The parties also agreed to add one
    plaintiff from the Louisiana actions — Joseph McDonald — as a
    named plaintiff in this action. See 
    id. at 4-5
    .
    On February 4, 2002, Amtrak moved to dismiss some of the
    individual claims contained in the third amended complaint, see
    Def.’s Mot. to Dismiss, ECF No. 104, which it supplemented in
    response to the fourth amended complaint on August 28, 2002, see
    6
    Def.’s Suppl. Mem. in Supp. of Mot. to Dismiss, ECF No. 127. On
    September 26, 2002, the Court denied Amtrak’s motion. See
    Campbell v. Amtrak, 
    222 F. Supp. 2d 8
     (D.D.C. 2002). Amtrak had
    sought to dismiss one plaintiff’s claims on the grounds that the
    continuing-violations theory could not save those claims from
    being barred by the statute of limitations, to dismiss six other
    plaintiffs’ claims as “based on expired right-to-sue notices,”
    and to dismiss the claims of three other plaintiffs as barred by
    the settlement of another class-action lawsuit. See 
    id. at 9
    . In
    denying Amtrak’s motion to dismiss, the Court found that the
    continuing-violations theory could bring one plaintiff’s claims
    within the statutory period, that further factual development
    was required to determine whether other plaintiffs were entitled
    to equitable tolling of the statute of limitations, and that
    plaintiffs’ claims were not clearly covered by the settlement
    agreement. 
    Id. at 10-14
    .
    C.   The Related Case Of Bethea v. Amtrak Police Department
    On July 11, 2001, Loretta Bethea filed an individual
    employment-discrimination lawsuit against the Amtrak Police
    Department in this court. See Compl., Bethea v. Amtrak Police
    Department, No. 01-cv-01513, ECF No. 1. Ms. Bethea alleged that
    she had suffered discrimination on the basis of her race and
    gender in connection with promotions and discipline. See
    generally 
    id.
     Amtrak answered the complaint on September 6,
    7
    2001. See Answer, Bethea v. Amtrak Police Department, No. 01-cv-
    01513, ECF No. 5. On July 11, 2011, the parties requested a
    continuance of the initial scheduling conference in view of a
    request to consolidate Bethea with Campbell for pretrial
    purposes, see Joint Mot. to Continue, Bethea v. Amtrak Police
    Department, No. 01-cv-01513, ECF No. 11, and on May 2, 2003, the
    cases were consolidated for pretrial purposes, see Order, ECF
    No. 139.
    D.    The Parties Proceed To Class-Certification Discovery
    Meanwhile, discovery was well under way in Campbell.
    Immediately after denying Amtrak’s 2002 motion to dismiss, the
    Court entered an Order directing the parties to propose “an
    appropriate schedule for the completion of discovery in this
    matter.” Order, ECF No. 132 at 1. After receiving the parties’
    proposal, the Court entered a Scheduling Order on November 7,
    2002. See Sched. Order, ECF No. 135. The Scheduling Order
    provided that class-certification discovery would be completed
    by November 5, 2003, with expert-discovery regarding class
    certification to be completed by February 5, 2004. See 
    id.
     at 1—
    2. The parties had also requested that the Court set a schedule
    for summary-judgment briefing. See Joint Status Report, ECF No.
    133. The Court directed that both the class-certification and
    summary-judgment motions be filed by April 5, 2004, with the
    8
    motions to be ripe by July 6, 2004. See Scheduling Order, ECF
    No. 135 at 3.
    This schedule was extended at the parties' request on many
    occasions. See Am. Sched. Order, ECF No. 155; Minute Order of
    March 26, 2004; Am. Sched. Order, ECF No. 186; Minute Order of
    Sept. 14, 2004; Am. Sched. Order, ECF No. 205; Minute Order of
    Jan. 14, 2005. The parties requested additional continuances to
    work through discovery disputes and to create a joint database
    of employment-related data. See Minute Order of Sept. 9, 2005;
    Pls.’ Mot. for Sanctions, ECF No. 231; Minute Order of Nov. 8,
    2006.
    On December 30, 2010, the Court entered a Revised
    Scheduling Order providing that the motions for class
    certification and summary judgment would be fully briefed by
    December 23, 2011. Sched. Order, ECF No. 280. That schedule was
    again modified due to the Supreme Court’s grant of certiorari in
    Wal-Mart Stores, Inc. v. Dukes, 
    564 U.S. 338
    , 354 (2011). Minute
    Order of May 10, 2011.
    E.   The Parties Brief Their Motions For Class
    Certification And Summary Judgment
    On February 21, 2012, plaintiffs filed their motion for
    class certification. See Pls.’ Mot. to Certify Class, ECF No.
    303. Amtrak filed its opposition on June 26, 2012, along with
    its motion for partial summary judgment. See Def.’s Opp. to Mot.
    9
    to Certify Class, ECF No. 320; Def.’s Mot. for Summ. J., ECF No.
    328. On the same day, Amtrak filed its motions to exclude the
    report and testimony of several of plaintiffs’ experts. See
    Def.’s Mot. to Exclude Finkelman, ECF No. 319; Def.’s Mot. to
    Exclude Roth, ECF No. 329; Def.’s Mot. to Exclude Bradley and
    Fox, ECF No. 331. Amtrak further moved to partially strike the
    declarations of certain putative class members offered in
    support of plaintiffs’ motion for class certification. See
    Def.’s Mot. to Strike, ECF No. 330. These motions were all ripe
    by January 4, 2013.
    The parties had agreed to engage in private mediation for a
    period of ninety days following the exchange of expert reports,
    class-certification briefing, and summary-judgment briefing. See
    Joint Proposed Sched. Order, ECF No. 310 at 2. Accordingly, the
    Court held in abeyance the parties’ motions pending the
    conclusion of mediation. See Minute Order of Sept. 27, 2012. On
    March 4, 2013, the parties filed a joint status report
    indicating that mediation had been unsuccessful. See Joint
    Status Report, ECF No. 363. The Court subsequently requested
    that the parties file supplemental briefing discussing any new
    legal authority regarding class certification. See Minute Order
    of December 2, 2013. The parties submitted their supplemental
    briefing in early 2014. See Pls.’ Supp. Class Cert. Mem., ECF
    10
    No. 370; Def.’s Resp. to Pls.’ Supp. Class Cert. Mem., ECF No.
    371.
    II.    BACKGROUND
    A.   Amtrak’s Structure
    Amtrak provides passenger rail service through forty-six
    states and the District of Columbia. See Report of Drs. Edwin L.
    Bradley and Liesl M. Fox (“Bradley/Fox Rep.”), ECF No. 304-1 at
    3. In the period after its inception in 1971, Amtrak was
    “basically a centrally managed corporation in D.C.” Dep. of
    Gilbert Mallery (“Mallery Dep.”), ECF No. 323-7 at 4. In 1994,
    Amtrak began creating “strategic business units” or “SBUs” with
    the goal of organizing the business “around the services that
    existed” as opposed to around a corporate headquarters. Dep. of
    Lee W. Bullock (“Bullock Dep.”), ECF No. 323-1 at 6; see also
    Mallery Dep., ECF No. 323-7 at 4 (explaining that the SBUs were
    created “to decentralize decision making” and “to move decision
    making in the corporation closer to the customers”). While
    decisions relating to Amtrak’s “financial targets” and “ultimate
    strategy” for the collective-bargaining process were still
    centered in Amtrak’s corporate headquarters in the District of
    Columbia, other decisions, like those related to budgets and
    marketing, were delegated to the SBUs. Bullock Dep., ECF No.
    323-1 at 9. For example, although the SBUs followed the “broad”
    human-resources policies set at the corporate level, each SBU
    11
    had its own human-resource director and decisions with respect
    to “hiring and firing” employees were made at the SBU level.
    Mallery Dep., ECF No. 323-7 at 4-5. Thus, while Amtrak’s
    corporate headquarters endeavored to ensure that any “federal
    and company-wide mandates were complied with,” “the day-to-day
    decisions were delegated to the HR professionals in the business
    units” who “basically enforced, monitored, controlled to make
    sure those corporate policies were followed.” Id. at 5.
    The SBUs were disbanded in 2002, and Amtrak returned to a
    more traditional structure under which it was organized by
    functional department at the corporate level and by operating
    division at the field level. Decl. of Patricia Kerins (“Kerins
    Decl.”), ECF No. 328-7 ¶ 28; Dep. of Edward Valentine Walker,
    III (“Walker Dep.”), ECF No. 309-4 at 3. Although Amtrak has
    eighteen departments, plaintiffs’ expert Thomas Roth postulates
    that approximately ninety-seven percent of Amtrak’s unionized
    workforce resides in one of five departments. Decl. and Expert
    Rep. of Thomas R. Roth (“Roth Rep.”), ECF No. 304-2 ¶¶ 8, 15.
    According to Mr. Roth, these five departments coincide with five
    functional categories — or “craft” groups — that are useful “for
    analytical purposes”: operating, equipment maintenance,
    maintenance of way, clerical/on-board services, and security.
    Id. ¶ 9. Mr. Roth opines that employees in these five craft
    groups have “a fundamentally shared function” and that the jobs
    12
    in each of the categories “share common work sites and
    supervision.” Id. ¶ 21. In addition, Mr. Roth asserts that, even
    though Amtrak’s employees are represented by seventeen different
    unions, employees within each craft group tend to negotiate
    common terms and common work conditions in their collective-
    bargaining agreements. Id. ¶ 25. Finally, Mr. Roth notes that
    the “rules governing discipline and grievances are common to a
    substantial degree within each functional employee group.” Id. ¶
    31.
    B.   Hiring And Promotions
    Amtrak has a corporate hiring, promotion, and transfer
    policy that was created “to provide guidelines to Amtrak
    supervision on how jobs are filled through employment,
    promotion, and transfer of employees.” See May 1, 1994 Amtrak
    Employment/Promotion/Transfer Policy (“1994 Amtrak Hiring
    Policy”), ECF No. 307-2 at 3. This policy has been the same
    since January 1, 1989. See, e.g., Jan. 1, 1989 Amtrak
    Employment/Promotion/Transfer Policy, ECF No. 307-1 at 3; Sept.
    2000 Amtrak Employment, Promotion and Transfer Policy, ECF No.
    307-3 at 3.
    Pursuant to that policy, positions covered by collective-
    bargaining agreements (“agreement-covered positions”) must be
    “advertised for bid in accordance with the applicable labor
    agreement.” 1994 Amtrak Hiring Policy, ECF No. 307-2 at 12.
    13
    Local employees who are members of the union that covers the
    vacant position are eligible to bid on the position. Decl. of
    Sarah Ray (“Ray Decl.”), ECF No. 322-5 ¶ 4. Generally, the most
    senior employee who places a bid and otherwise meets the
    qualifications is placed in the position. Id. ¶ 5. If no local
    employee bids on the position, then human resources will
    determine if a member of the relevant union in a different
    geographic location wishes to transfer to take the position. Id.
    ¶ 7. That employee would also be required to meet any
    qualification requirements before being awarded the position
    permanently. Id.
    When positions are not filled after this internal bidding
    process, certain steps must be taken to fill a vacancy. See 1994
    Amtrak Hiring Policy, ECF No. 307-2 at 13. The hiring process
    begins with the job requisition form, which provides detailed
    information regarding the duties and responsibilities associated
    with the position, the requisite qualifications and experience
    required, and any preferred qualifications and experience. Id.
    at 8; Ray Decl., ECF No. 322-5 ¶ 10. Generally, a hiring manager
    will determine the hiring criteria for an open position by
    reviewing a job description or prior requisition forms. Ray
    Decl., ECF No. 322-5 ¶ 11; Decl. of Suzanne Allan (“Allan
    Decl.”), ECF No. 321-3 ¶ 5. The process of preparing and
    14
    approving a job requisition form varies by department. Decl. of
    Barbara Wu (“Wu Decl.”), ECF No. 322-8 ¶ 4.
    The selection criteria for each position vary significantly
    and depend on the job description and requirements described in
    the job requisition form. Wu Decl., ECF No. 322-8 ¶ 9; Ray
    Decl., ECF No. 322-5 ¶ 12. Local applicants are preferred for
    certain positions, especially those for on-board crew. Wu Decl.,
    ECF No. 322-8 ¶ 9; Ray Decl., ECF No. 322-5 ¶ 22. Someone in
    human resources is responsible for screening all the
    applications for a particular job to determine which applicants
    match the minimum requirements, have similar experience to that
    of the position at issue, and have a stable employment history.
    Wu Decl., ECF No. 322-8 ¶ 9. A hiring manager may ask that the
    human-resources recruiter provide the applications for all
    candidates that meet the minimum requirements of the position or
    may request applications from only the most qualified
    applicants. Ray Decl., ECF No. 322-5 ¶ 25.
    Almost all agreement-covered positions require that the
    applicant pass a test or set of tests prior to becoming eligible
    for interviews. Wu Decl., ECF No. 322-8 ¶ 10. Applicants who
    meet the minimum requirements for a vacancy are invited to take
    the test. Kerins Decl., ECF No. 328-7 ¶ 8. The tests
    administered vary depending on the position and the union
    involved, and they have changed over time. Wu Decl., ECF No.
    15
    322-8 ¶ 10. Passing a test does not necessarily mean that the
    applicant will be interviewed for the position; rather, only the
    most qualified applicants are generally interviewed for each
    position. Id. ¶ 13. Typically, at least three to five applicants
    are selected to be interviewed for each vacancy. Ray Decl., ECF
    No. 322-5 ¶ 29; Allan Decl., ECF No. 321-3 ¶ 10.
    The hiring manager, in consultation with others, develops a
    set of interview questions. Wu Decl., ECF No. 322-8 ¶ 15. The
    types of questions asked during an interview depend on the
    position at issue, any unique requirements relating to the
    particular opening, and the preferences of the hiring manager.
    Kerins Decl., ECF No. 328-7 ¶ 13. Each applicant who interviews
    for a particular position is asked the same set of questions. Wu
    Decl., ECF No. 322-8 ¶ 15. Interviews are conducted by panels of
    managers and, in some cases, a union representative. Id. ¶ 17.
    At some point before they start conducting interviews, most
    managers participate in a behavioral-based interview training
    led by a member of the human-resources department. Kerins Decl.,
    ECF No. 328-7 ¶ 12; Decl. of Karen Broadwater, ECF No. 321-6 ¶
    21.
    At the conclusion of the interview, the panel members
    provide each other with feedback on the candidate. Allan Decl.,
    ECF No. 321-3 ¶ 17. For some positions, interviewers use a
    rating form to score the applicant’s responses. Wu Decl., ECF
    16
    No. 322-8 ¶ 20. If the scores of each panel member vary, a
    consensus form may be used to reach a final score. Id. Unless
    the applicant has a very low score in a key competency, the
    applicant with the highest total score is usually recommended
    for the position. Id. In other cases, panel members may simply
    take notes during the interview to record their opinions about
    applicants’ responses. Kerins Decl., ECF No. 328-7 ¶ 15. The
    process of assessing candidates is “not a cut-and-dried type
    process,” but rather involves a “discussion . . . among the
    panel members about the strengths and weaknesses of a
    candidate.” Dep. of Sheila Davidson, ECF No. 306-2 at 16.
    Candidates are evaluated based on their experience, interview
    performance, and professionalism. Kerins Decl., ECF No. 328-7 ¶
    15.
    While each member of the panel shares his or her thoughts
    about the qualifications of the candidates, the ultimate
    decision of which candidate to recommend for the vacancy lies
    with the hiring manager. Kerins Decl., ECF No. 328-7 ¶ 16. The
    hiring manager’s selection may be reviewed by his or her
    supervisor, and the decision is ultimately approved by the
    human-resources department at Amtrak’s corporate headquarters.
    Id. ¶ 18; Walker Dep., ECF No. 309-4 at 11-12.
    Dr. Bradley and Dr. Fox, plaintiffs’ statistical experts
    who analyzed Amtrak’s hiring and promotion data, found that
    17
    African-American individuals were hired and promoted for vacant
    positions at rates lower than their non-African-American
    counterparts. Bradley/Fox Rep., ECF No. 304-1 at 4.
    Specifically, Dr. Bradley and Dr. Fox concluded that 3,053 fewer
    African-American individuals were hired or promoted than would
    be expected from the pool of applicants, after removing those
    candidates in the pool who were not minimally-qualified for the
    position. Id. at 15-16. Dr. Bradley and Dr. Fox did not,
    however, consider other criteria — such as seniority, work
    experience, education, or whether the applicant had previously
    worked at Amtrak — that may have affected hiring or promotion
    decisions. Dep. of Edwin Bradley (“Bradley Dep.”), ECF No. 331-3
    at 23-24, 28, 56-57.
    C.   Discipline
    The collective-bargaining agreements usually contain rules
    governing the discipline process. Decl. of Charles E. Woodcock,
    III (“Woodcock Decl.”), ECF No. 322-7 ¶ 23. The discipline
    process at Amtrak generally progresses as follows: (1) verbal
    warning; (2) written warning; (3) disciplinary hearing if a
    formal charge is filed; (4) a second disciplinary hearing if a
    formal charge is filed; and (5) a third disciplinary hearing if
    a formal charge is filed, which may in turn lead to termination.
    Id. ¶ 20. Discipline decisions are generally made by and subject
    to the discretion of a local manager. Id. ¶ 22. The final
    18
    decision to terminate an individual currently rests with the
    vice-president of human resources. Walker Dep., ECF No. 309-4 at
    4-5.
    This basic disciplinary process is similar for employees
    across all labor unions, though there are some limited
    differences. See Dep. of LaVerne Miller, ECF No. 308-6 at 34-35
    (Amtrak corporate designee testifying that the claims and
    grievance procedures across craft groups are “equal across the
    board”); Woodcock Decl., ECF No. 322-7 ¶ 23; Roth Rep., ECF No.
    304-2 ¶ 31. For example, each collective-bargaining agreement
    has “just cause” type provisions that afford employees the right
    to file an appeal of any disciplinary charges. Woodcock Decl.,
    ECF No. 322-7 ¶ 23; see also Roth Rep., ECF No. 304-2 ¶ 32
    (explaining that the language of the grievance procedures vary
    between collective-bargaining agreements but that they all
    “embody the principles of just cause, fair and impartial
    investigation, timeliness and [] other due process elements”).
    Despite these broad similarities, rules governing employee
    conduct may vary by position. Woodcock Decl., ECF No. 322-7 ¶
    21. For example, passenger engineers are subject to certain
    federal regulations and operating rules that other employees are
    not. Id. ¶ 21. Likewise, there may be different expectations for
    ticket clerks, who deal with customers on a daily basis, than
    19
    for other employees whose jobs do not require interaction with
    the public. Id. ¶ 21.
    Dr. Bradley and Dr. Fox compared the rates of disciplinary
    charges between African-American and non-African-American
    unionized employees at Amtrak. Bradley/Fox Rep., ECF No. 304-1
    at 16. They found that, of the 24,136 disciplinary charges
    issued to Amtrak employees during the analysis time period,
    10,651 charges were brought against African-American employees,
    even though one would have expected only 8,924 charges to be
    brought against African-American employees during that same
    period. Id. Notably, Dr. Bradley and Dr. Fox did not make these
    comparisons among employees that were similarly situated — for
    example, Dr. Bradley explained that his analysis did not
    consider the specific position or union to which the employee
    belonged, an employee’s previous disciplinary history, the
    severity of the offense and discipline issued, or the employee’s
    tenure at Amtrak. See Bradley Dep., ECF No. 331-3 at 65-67.
    D.   Work Environment
    Amtrak, like many employers of its size, has corporate
    policies prohibiting discrimination, harassment, and
    retaliation. See Def.’s Opp. to Mot. to Certify Class, ECF No.
    320 at 16-19; Dep. of Karen Broadwater Ex. 1, ECF No. 322-10 at
    14-17 (Sept. 20, 2011 EEO and Affirmative Action Policy); id.
    Ex. 2, ECF No. 322-10 at 18-22 (Anti-Discrimination and Anti-
    20
    Harassment Policy). In addition, as a result of the settlements
    entered in McLaurin v. Amtrak and Thornton v. Amtrak, Amtrak
    established a Dispute Resolution Office (“DRO”) in 1999, which
    was located within the Business Diversity Department. Decl. of
    Dawn Marcelle (“Marcelle Decl.”), ECF No. 322-2 ¶¶ 2, 9. The
    function of the DRO was to investigate internal complaints of
    harassment or discrimination raised by agreement-covered
    employees. Id. ¶ 10. Employees could initiate complaints
    internally in a variety of ways: they could raise complaints
    with supervisors, report complaints directly to their local DRO
    office, or call the DRO hotline. Id. ¶ 14.
    Wanda Hightower, the Vice President of the Business
    Diversity Department between April 1999 and February 2001,
    testified that she and her staff attempted to aggressively
    investigate race discrimination complaints during her tenure at
    Amtrak. See Dep. of Wanda Hightower (“Hightower Dep.”), ECF No.
    309-9 at 7-8. Ms. Hightower testified that these efforts were
    met with resistance by both lower-level employees and upper
    management at Amtrak. See id. at 14-18, 22-23, 29. She also
    stated that racial discrimination “was bad across the system” at
    Amtrak, particularly among the “rank and file.” Id. at 30. This
    testimony is supported by the declarations of named plaintiffs
    and putative class members, some of whom point to individual
    instances of racism and others of whom point to a more pervasive
    21
    culture of racism during their tenure at Amtrak. See Pls.’ Mot.
    for Class Cert. Ex. 8, ECF No. 304-8. These declarations detail
    instances of overt and obvious racism (e.g., use of racial
    epithets, hanging black dolls or monkeys from nooses in employee
    common areas, racially-charged physical threats), in addition to
    allegations of more subtle racism (e.g., assigning African-
    American employees more menial job assignments). See id.
    In June 2007, Amtrak dissolved the Business Diversity
    Department, and the DRO was merged into the Human Resources
    Department. Marcelle Decl., ECF No. 322-2 ¶ 24. After the DRO
    moved to the Human Resources Department, it continued to receive
    and investigate internal complaints through May 2011, at which
    time the DRO was dissolved. Id. ¶ 25. All complaints related to
    discrimination are now addressed by the EEO Compliance Unit,
    which is part of Amtrak’s Legal Department. 2
    III. EXCLUSION OF EXPERT TESTIMONY
    Amtrak moves to exclude the testimony and reports of
    various experts proffered by plaintiffs in support of their
    motion for class certification. See Def.’s Mot. to Exclude
    Finkelman, ECF No. 319; Def.’s Mot. to Exclude Roth, ECF No.
    2    Prior to the dissolution of the DRO, Amtrak’s EEO
    Compliance Unit only handled complaints by employees that were
    filed with a federal, state, or local agency, along with any
    internal complaints in which an employee was represented by
    counsel. Marcelle Decl., ECF No. 322-2 ¶ 10.
    22
    329; Def.’s Mot. to Exclude Bradley and Fox, ECF No. 331. Amtrak
    contends that these experts must be excluded under Federal Rule
    of Evidence 702 and Daubert v. Merrell Dow Pharmaceuticals,
    Inc., 
    509 U.S. 579
     (1993). Plaintiffs argue that Daubert’s
    admissibility considerations are not relevant at the class-
    certification stage and, in any event, that their evidence is
    admissible.
    A.   The Court Must Conduct A Full Daubert Inquiry Before
    Relying On Expert Testimony At The Class-Certification
    Stage
    The issue of how to evaluate expert testimony at the class-
    certification stage “ha[s] beguiled the federal courts.” Newberg
    on Class Actions § 7:24 (5th ed. 2014). The Supreme Court has
    strongly hinted that district courts should apply the same
    standard at the class-certification stage that they would apply
    to expert testimony offered at a later stage of proceedings. See
    Wal-Mart Stores, Inc. v. Dukes, 
    564 U.S. 338
    , 354 (2011)
    (casting “doubt” on the conclusion “that Daubert did not apply
    to expert testimony at the certification stage of class-action
    proceedings”). Indeed, in 2013, the Supreme Court granted
    certiorari to resolve the issue but was unable to do so because
    “the question was not properly posed.” See Newberg on Class
    Actions § 7:24 (citing Comcast Corp. v. Behrend, 
    569 U.S. 27
    (2013)). The question is difficult “for the simple reason that
    certification is generally not the time to decide the merits of
    23
    the case, yet expert witness testimony relevant to the merits
    often is proffered as also relevant to a prong of the
    certification inquiry.” Newberg on Class Actions § 7:24.
    The Court of Appeals for the District of Columbia Circuit
    (“D.C. Circuit”) has not yet weighed in on whether a full
    analysis under Daubert is required at the class-certification
    stage. See In re Rail Freight Fuel Surcharge Antitrust Litig.,
    No. 07-0489, 
    2016 WL 2962186
    , at *2 (D.D.C. May 20, 2016); Moore
    v. Napolitano, 
    926 F. Supp. 2d 8
    , 16, n.2 (D.D.C. 2013);
    Kottaras v. Whole Foods Mkt., Inc., 
    281 F.R.D. 16
    , 26 (D.D.C.
    2012). Most circuit courts that have addressed the issue have
    found that, where an expert’s testimony is critical to class
    certification, “a district court must conclusively rule on any
    challenge to the expert’s qualifications or submissions prior to
    ruling on a class certification motion” — i.e., “the district
    court must perform a full Daubert analysis before certifying the
    class.” Am. Honda Motor Co. v. Allen, 
    600 F.3d 813
    , 815-16 (7th
    Cir. 2010); see also, e.g., Ellis v. Costco Wholesale Corp., 
    657 F.3d 970
    , 982 (9th Cir. 2011) (district court “correctly applied
    the evidentiary standard set forth in Daubert” at the class-
    certification stage); Sher v. Raytheon Co., 419 F. App’x 887,
    890-91 (11th Cir. 2011) (“Here the district court refused to
    conduct a Daubert-like critique of the proffered experts’
    qualifications. This was error.”); In re Carpenter Co., No. 14-
    24
    0302, 
    2014 U.S. App. LEXIS 24707
    , at *10-11 (6th Cir. Sep. 29,
    2014) (district court did not abuse its discretion by analyzing
    expert testimony offered in support of class certification under
    Daubert); In re Blood Reagents Antitrust Litig., 
    783 F.3d 183
    ,
    187 (3d Cir. 2015) (“We join certain of our sister courts to
    hold that a plaintiff cannot rely on challenged expert
    testimony, when critical to class certification, to demonstrate
    conformity with Rule 23 unless the plaintiff also demonstrates,
    and the trial court finds, that the expert testimony satisfies
    the standard set out in Daubert.”); but see In re Zurn Pex
    Plumbing Prods. Liab. Litig., 
    644 F.3d 604
    , 611-14 (8th Cir.
    2011) (approving use of a “focused Daubert analysis” instead of
    a “full and conclusive Daubert inquiry”).
    The courts that have required a full Daubert inquiry
    generally focus on the “rigorous analysis” that a district court
    must apply to a plaintiff’s request for class certification — a
    standard that, after Comcast, clearly applies to expert
    testimony that is proffered in support a request for
    certification. See Comcast Corp. v. Behrend, 
    569 U.S. 27
    , 34-35
    (2013). This means that the district court must discern whether
    a plaintiff has proven compliance with Rule 23(a) “in fact” and
    whether the plaintiff has “‘satisf[ied] through evidentiary
    proof at least one of the provisions of Rule 23(b).’” In re
    Blood Reagents Antitrust Litig., 783 F.3d at 187. Under this
    25
    approach, “[e]xpert testimony that is insufficiently reliable to
    satisfy the Daubert standard cannot ‘prove’ that the Rule 23(a)
    prerequisites have been met ‘in fact,’ nor can it establish
    ‘through evidentiary proof’ that Rule 23(b) is satisfied.” Id.;
    see also, e.g., Messner v. Northshore Univ. HealthSystem, 
    669 F.3d 802
    , 812 (7th Cir. 2012) (“Failure to conduct [a Daubert]
    analysis when necessary . . . would mean that the unreliable
    testimony remains in the record, a result that could easily lead
    to reversal on appeal.”).
    The Eighth Circuit — the only Circuit to have reached a
    contradictory decision after Dukes — sanctioned a “‘tailored’
    Daubert analysis” that “examined the reliability of the expert
    opinions in light of the available evidence and the purpose for
    which they were offered.” In re Zurn Pex Plumbing Prods. Liab.
    Litig., 
    644 F.3d 604
    , 612 (8th Cir. 2011); see also 
    id. at 611
    (declining to “adopt a new rule, requiring a district court to
    determine conclusively at an early stage, not just whether or
    not expert evidence is sufficient to support class certification
    under Rule 23, but also whether that evidence will ultimately be
    admissible for trial”). This holding emphasized the “inherently
    preliminary nature of pretrial evidentiary and class
    certification rulings,” and noted that the “main purpose of
    Daubert” — “to protect juries from being swayed by dubious
    scientific testimony” — does not arise in motions for class
    26
    certification “where the judge is the decision maker.” 
    Id. at 613
    .
    The Court is persuaded that it must conduct a full Daubert
    inquiry at the class-certification stage. Concerns regarding the
    tentativeness of class-certification rulings have been
    undermined significantly by the 2003 amendment to Rule 23, which
    removed language permitting a conditional class-certification
    ruling. See In re Zurn Pex Plumbing Prods. Liab. Litig., 
    644 F.3d at 630
     (Gruender, J., dissenting) (arguing that “the 2003
    amendments to Rule 23 removed the provision that class
    certification ‘may be conditional’” and that failing to conduct
    a full Daubert inquiry regarding evidence crucial to a
    certification decision would mean that “the case will proceed
    beyond class certification on the basis of inadmissible,
    unreliable expert testimony”). The fact that a class-
    certification ruling may be revisited, Fed. R. Civ. P.
    23(c)(1)(C), or that merits-related discovery may lead to
    additional evidence that supports an expert’s conclusions, does
    not warrant applying a relaxed standard to an expert’s opinions
    at the certification stage. Moreover, after Dukes, “[t]he Court
    must consider merits questions when those questions overlap with
    Rule 23’s requirements.” Coleman through Bunn v. Dist. of
    Columbia, 
    306 F.R.D. 68
    , 77 (D.D.C. 2015); cf. Amgen Inc. v.
    Connecticut Ret. Plans & Tr. Funds, 
    568 U.S. 455
    , 466 (2013)
    27
    (“Merits questions may be considered to the extent — but only to
    the extent — that they are relevant to determining whether the
    Rule 23 prerequisites for class certification are satisfied.”).
    Accordingly, the concern that conducting a full Daubert hearing
    would inappropriately prejudge a merits issue is less
    persuasive; if that merits issue overlaps with Rule 23, the
    Court must prejudge it to the extent necessary to assess
    plaintiffs’ compliance with Rule 23.
    In short, the Court agrees with the heavy weight of
    authority that, when a party moves to exclude expert testimony
    proffered in support of a motion for class certification, the
    district court must perform a full Daubert analysis before
    certifying a class. See In re Rail Freight Fuel Surcharge
    Antitrust Litig., No. 07-0489,   , at *2 (D.D.C. May 20, 2016)
    (addressing the “reliability of the experts’ methodology under
    Daubert and Rule 702” at the class-certification stage);
    Kottaras v. Whole Foods Mkt., Inc., 
    281 F.R.D. 16
    , 26 (D.D.C.
    2012) (“the Court agrees with other courts that the Rule calls
    for careful and searching analysis of all evidence with respect
    to whether Rule 23’s certification requirements have been met,
    including expert opinions”).
    B.   Legal Standard For Admissibility Of Expert Testimony
    A district court has “‘broad discretion in determining
    whether to admit or exclude expert testimony.’” United States ex
    28
    rel. Miller v. Bill Harbert Int’l Constr., Inc., 
    608 F.3d 871
    ,
    895 (D.C. Cir. 2010) (citation omitted). The exercise of that
    discretion is governed by Federal Rule of Evidence 702, which
    provides that:
    A witness who is qualified as an expert by
    knowledge, skill, experience, training, or
    education may testify in the form of an
    opinion or otherwise if:
    (a) the expert’s scientific, technical, or
    other specialized knowledge will help the
    trier of fact to understand the evidence or to
    determine a fact in issue;
    (b) the testimony is based on sufficient facts
    or data;
    (c) the testimony is the product of reliable
    principles and methods; and
    (d) the expert has reliably applied the
    principles and methods to the facts of the
    case.
    Rule 702 requires the district court to act as a
    “gatekeeper” for expert testimony by ensuring that “any and all
    scientific testimony or evidence admitted is not only relevant,
    but reliable.” Daubert, 
    509 U.S. at 589
    ; see also Ambrosini v.
    Labarraque, 
    101 F.3d 129
    , 133 (D.C. Cir. 1996) (“[t]he Daubert
    standard involves a two-prong analysis that centers on
    evidentiary reliability and relevancy”). In Kumho Tire Co. v.
    Carmichael, 
    526 U.S. 137
    , 141 (1999), the Supreme Court made
    clear that this gatekeeping obligation applies to all expert
    testimony, not just scientifically-based testimony.
    29
    Under Rule 702, expert testimony is reliable if (1) it is
    based on sufficient facts or data; (2) it is the product of
    reliable principles and methods; and (3) the expert has applied
    the principles and methods reliably to the facts of the case.
    See, e.g., Heller v. District of Columbia, 
    801 F.3d 264
    , 271
    (D.C. Cir. 2015) (“[C]ourts are obligated to ‘determine whether
    [expert] testimony has a reliable basis in the knowledge and
    experience of [the relevant] discipline.’”) (quoting Kumho Tire,
    
    526 U.S. at 149
    ); Robinson v. Dist. of Columbia, 
    75 F. Supp. 3d 190
    , 199 (D.D.C. 2014) (“‘[t]he trial judge ... must find that
    [the proffered testimony] is properly grounded, well-reasoned
    and not speculative before it can be admitted’”) (quoting Fed.
    R. Evid. 702 advisory committee notes). In determining
    reliability, the district court must “focus solely on principles
    and methodology, not on the conclusions that they generate.”
    Ambrosini, 
    101 F.3d at 133
    . The trial judge has “considerable
    leeway in deciding in a particular case how to go about
    determining whether particular expert testimony is reliable.”
    Kumho Tire, 
    526 U.S. at 152
    ; see also Estate of Gaither ex rel.
    Gaither v. Dist. of Columbia, 
    831 F. Supp. 2d 56
    , 62 (D.D.C.
    2011) (“‘Exactly how reliability is evaluated may vary from case
    to case, but what remains constant is the requirement that the
    trial judge evaluate the reliability of the testimony before
    allowing its admission at trial.’”) (citation omitted).
    30
    “The second Daubert prong relates to relevance and is
    fairly straightforward.” Rothe Dev., Inc. v. Dept. of Defense,
    
    107 F. Supp. 3d 183
    , 197 (D.D.C. 2015). The district court “must
    determine whether the proffered testimony is sufficiently tied
    to the facts of the case and whether it will aid the factfinder
    in resolving a factual dispute. Fed. Trade Comm’n v. Whole Foods
    Market, Inc., No. 07-1021, 
    2007 WL 7632283
    , at *1 (D.D.C. July
    17, 2007). “The Daubert Court described this consideration as
    one of ‘fit.’” Ambrosini, 
    101 F. 3d at 134
    . Although the
    district court assumes only a “limited” gate-keeping role under
    these standards, and “‘[r]ejection of an expert’s testimony is
    the exception rather than the rule,’” see Paige Int’l, Inc. v.
    XL Specialty Ins. Co., No. 14-1244, 
    2016 WL 3024008
    , at *3
    (D.D.C. May 25, 2016) (citation omitted), the “decision to
    receive expert testimony” cannot be “‘simply tossed off to the
    jury under a ‘let it all in’ philosophy,’” see Joy v. Bell
    Helicopter Textron, Inc., 
    999 F.2d 549
    , 569 (D.C. Cir. 1993)
    (citation omitted). As such, “[t]he issue for the Court to
    determine is whether . . . [the expert’s] assumptions amount to
    ‘rampant speculation’ and should be excluded, or whether [the]
    assumptions merely represent a weak factual basis for [the
    expert’s] testimony that is appropriately challenged on cross
    examination.” Boyar v. Korean Air Lines Co., 
    954 F. Supp. 4
    , 7
    (D.D.C. 1996).
    31
    C.   Amtrak’s Motion To Exclude Dr. Finkelman’s Testimony
    And Report Is Granted
    1.   Dr. Finkelman’s Qualifications And Opinions
    Dr. Jay Finkelman is an industrial-organizational
    psychologist and the Vice-President of Academic Affairs and
    Chief Academic Officer of the Chicago School of Professional
    Psychology. Expert Rebuttal Report of Jay Finkelman, PhD, ABPP,
    CPE (“Finkelman Rebuttal Rep.”), ECF No. 344-2 at 2. He holds a
    Ph.D. in Industrial-Organizational Psychology from New York
    University and an M.B.A. in Industrial Psychology from the
    Bernard M. Baruch School of Business. Expert Rep. of Jay
    Finkelman, PhD, ABPP, CPE (“Finkelman Rep.”), ECF No. 304-3 at
    3. Dr. Finkelman “specializes” in a variety of topics, including
    human resources, staffing industry management practices,
    employment discrimination, adverse impact, performance
    appraisal, and psychometrics. 
    Id. at 5
    . He has “had hundreds of
    retentions and depositions” and has “testified at trial over 46
    times.” Id. at 3.
    Dr. Finkelman was retained by plaintiffs to “review the
    hiring, promotional, and discipline policies of Amtrak” and
    “determine whether or not they were consistent with generally
    accepted Human Resource Management practices and the principles
    of Industrial-Organizational Psychology.” Finkelman Rep., ECF
    No. 304-3 at 17-18. In preparing his report, Dr. Finkelman
    32
    relied on plaintiffs’ third amended complaint, Amtrak’s answer
    to that complaint, the depositions and related exhibits of three
    of Amtrak’s corporate representatives, the deposition and
    related exhibits of one fact witness, the expert report of Dr.
    Bradley and Dr. Fox, a document titled “Selection Roulette,” and
    the declarations of class members. See Finkelman Report at 26;
    Dep. of Jay M. Finkelman (“Finkelman Dep.”), ECF No. 319-3 at 5.
    Based on his review of these selected materials, Dr.
    Finkelman provided an expert report, the substance of which
    spans approximately eight pages. In his report, in a section
    titled “Opinions,” Dr. Finkelman first sets forth background
    principles undergirding “good” human-resource management
    policies and practices and states that Amtrak “did not appear to
    have adequate mechanisms in place” to accomplish certain
    objectives of human-resource management. Finkelman Rep., ECF No.
    304-3 at 19-20. Notably, he does not cite any studies, data,
    articles, or other academic sources supporting any of his
    observations.
    Dr. Finkelman next makes “[a] few specific observations”
    with respect to this case. Id. at 18-19. Those observations
    consist of twenty bullet points that point out various
    problematic human-resources practices purportedly found at
    Amtrak. Id. at 19-24. Nine of those bullets are summaries of
    testimony of Amtrak managers provided to Dr. Finkelman by
    33
    plaintiffs’ counsel in a document titled “Selection Roulette,”
    coupled with Dr. Finkelman’s observations about the hiring
    practices described in those summaries. Compare id. at 20-23,
    with Finkelman Dep. Ex. 7, ECF No. 319-3 at 130-136. Based on
    his review of the summaries, Dr. Finkelman concludes that
    Amtrak’s employment policies and practices failed to accomplish
    the “dual” goals of human-resource management: to protect
    employees from discrimination, harassment, and retaliation while
    “also protecting the organization[] from liability associated
    with improper policies and practices.” Finkelman Rep., ECF No.
    304-3 at 18. According to Dr. Finkelman, this failure is
    attributable to the fact (1) that Amtrak has “few if any
    controls against intentional or inadvertent bias” and (2) that
    Amtrak’s hiring, promotional, and discipline policies are “not
    consistent with generally accepted Human Resource Management
    practices nor with the professional requirements of Industrial-
    Organizational Psychology.” Id. at 24; see also Finkelman Dep.,
    ECF No. 319-3 at 4-5 (opining that, although Amtrak had
    overarching policies in place governing hiring, promotion, and
    employee discipline, individual managers departed from those
    policies in a manner that “allowed for subjectivity and the
    potential for bias or discrimination”).
    34
    2.   Dr. Finkelman’s Opinions Are Unreliable
    Amtrak argues that Dr. Finkelman’s report fails Daubert’s
    reliability prong because, among other reasons, Dr. Finkelman
    did not consider sufficient facts in forming his opinion. See
    Def.’s Mem. in Supp. Mot. to Exclude Finkelman, ECF No. 319-1 at
    19-25. Amtrak asserts that Dr. Finkelman’s opinions are
    supported only by “cherry-picked” documents selected by
    plaintiffs’ counsel, and that Dr. Finkelman failed to request,
    much less review, a host of other evidence “pertinent to the
    question he purportedly sought to answer — whether Amtrak’s
    policies, practices, and procedures are consistent with
    generally accepted human-resources practices and the general
    principles of industrial organizational psychology.” Id.
    Federal Rule of Evidence 702 requires expert testimony to
    be “based on sufficient facts or data” to be reliable. United
    States ex rel. Miller v. Bill Harbert Int’l Const., Inc., 
    608 F.3d 871
    , 894 (D.C. Cir. 2010) (quoting Fed. R. Evid. 702).
    Although an expert “need not consider every possible factor to
    render a ‘reliable’ opinion, the expert still must consider
    enough factors to make his or her opinion sufficiently reliable
    in the eyes of the court.” MicroStrategy Inc. v. Bus. Objects,
    S.A., 
    429 F.3d 1344
    , 1355 (Fed. Cir. 2005); Estate of Gaither ex
    rel. Gaither v. Dist. of Columbia, 
    831 F. Supp. 2d 56
    , 66
    (D.D.C. 2011) (expert must provide “meaningful measure of
    35
    detail” as to the expert’s “experience with and knowledge of”
    the facts underlying his opinions).
    After reviewing Dr. Finkelman’s report and deposition
    testimony, the Court finds that Dr. Finkelman’s expert opinion
    relies on insufficient facts and data and therefore lacks the
    reliability required under Rule 702. For example, although Dr.
    Finkelman purports to opine about the human-resource management
    practices at Amtrak, he testified that he did not review
    information critical to those opinions, including the
    depositions of any human-resource managers, see Finkelman Dep.,
    ECF No. 319-3 at 5; documents related to any job-selection
    decisions by any Amtrak manager, see 
    id. at 23
    ; personnel files
    or documents related to any discipline decision made by Amtrak,
    see id.; or Amtrak’s discrimination complaint procedures or
    anti-discrimination training, see 
    id. at 45
    .
    Likewise, although he agreed that the collective-bargaining
    agreements applicable to plaintiffs “would have [an] impact” on
    Amtrak’s hiring, promotion, and disciplinary policies, see
    Finkelman Dep., ECF No. 319-3 at 25, he did not review those
    agreements prior to forming his opinions, see 
    id. at 22-23
    . Dr.
    Finkelman also testified that, although he “assume[s]” that the
    consent decrees imposed in previous employment-discrimination
    litigation involving Amtrak had an impact “on the hiring,
    promotional, or discipline policies at Amtrak,” he “didn’t read
    36
    the consent decrees” and therefore did not “know the exact
    changes that may have been made” by Amtrak in response to the
    decrees. 
    Id. at 25
    . Rather, Dr. Finkelman testified that he only
    considered limited “facts” in forming his opinion that Amtrak’s
    practices and policies were inconsistent with the goals of good
    human-resource management practices:
    Q. You say “Amtrak has not accomplished either
    objective, in my opinion.” What’s the basis
    for that statement?
    A. Well, the basis is the allegations that
    have been leveled by both the plaintiffs and
    perhaps other class members. In this matter,
    my review of the statements by supervisors as
    to how it is that they engage in selection or
    promotion. And I suppose also by the $16
    million that Amtrak had to pay in one of the
    earlier phases of litigation, which seemed to
    suggest that there is a problem and some
    wrongdoing.
    Finkelman Dep., ECF No. 319-3 at 26.
    Even in his consideration of these limited “facts,” Dr.
    Finkelman did little to confirm their accuracy. For example,
    although he offers opinions on the selection process used by
    supervisors in hiring and promoting employees, Dr. Finkelman did
    not read the deposition testimony of any supervisors. See
    Finkelman Dep., ECF No. 319-2 at 31. Instead, Dr. Finkelman
    relied on a document titled “Selection Roulette” in which
    plaintiffs’ counsel “summed up” the testimony of select
    supervisors. 
    Id. at 5
     (“The information from managers came from
    37
    the depositions that had taken place by managers. And I got that
    information through, I think, a document that’s referred to as a
    “selection roulette” or something like that.”); 
    id. at 28
    (affirming that he relied on the document titled “selection
    roulette” for management testimony). Dr. Finkelman conceded that
    he took no steps to verify the accuracy or the
    representativeness of the information in the “Selection
    Roulette” document. 
    Id. at 28-29
    . Indeed, Dr. Finkelman
    acknowledged that, “to figure out what really took place” at
    Amtrak, he would likely need to “get into more detail.” 
    Id. at 29
    . For purposes of the report, Dr. Finkelman explained
    From the descriptions that were given [in the
    “Selection Roulette” document], assuming that
    they are reasonably accurate, they are so far
    off in acceptable norm that I didn’t need any
    more at this point. I will look more
    carefully, and if — if the roulette has
    misrepresented   any   of  those   issues   or
    approaches, and if it didn’t accurately
    characterize what managers said, you know,
    that would be a different story. But there are
    specific citations that are included, and yes,
    I will be looking at those.
    
    Id.
     (emphasis added).
    Dr. Finkelman simply “assum[ed]” that plaintiffs’ counsel
    “accurately characterize[d]” the testimony of Amtrak managers
    regarding their hiring practices instead of independently
    reviewing that testimony himself — and, critically, proceeded to
    formulate the opinions set forth in his expert report based, in
    38
    part, on that unverified testimony. Such blind reliance on
    “facts” provided by plaintiffs’ counsel — combined with his
    failure to review other sources of information that he conceded
    could have affected Amtrak’s hiring, promotion, and disciplinary
    practices — renders his expert report unreliable. See, e.g.,
    Parsi v. Daioleslam, 
    852 F. Supp. 2d 82
    , 89 (D.D.C. 2012) (facts
    and data relied upon by expert were “patently insufficient”
    where expert “read only an apparently haphazard selection of
    defendant’s sources”); Sommerfield v. City of Chicago, 
    254 F.R.D. 317
    , 321 (N.D. Ill. 2008) (“Acceptance of the notion that
    an expert can reasonably base his opinion on summaries of
    deposition testimony prepared by a party’s lawyer would
    effectively eliminate Daubert’s insistence that an expert’s
    opinion be grounded on reliable information.”); Equal Emp’t
    Opportunity Comm’n v. Rockwell Int’l Corp., 
    60 F. Supp. 2d 791
    ,
    795 (N.D. Ill. 1999) (expert report unreliable where expert’s
    “sole source of information . . . c[ame] from summaries prepared
    by one of the litigants” and expert failed to “review the entire
    depositions”); Equal Emp’t Opportunity Comm’n v. Bloomberg L.P.,
    No. 07-8383, 
    2010 U.S. Dist. LEXIS 92511
    , at *46 (S.D.N.Y. Aug.
    31, 2010) (expert’s reliance “solely on the information fed to
    him by [plaintiff] without independently verifying whether the
    information [wa]s representative undermine[d] the reliability of
    his analysis”); Makor Issues & Rights, Ltd. v. Tellabs, Inc.,
    39
    No. 02-4356, 
    2010 U.S. Dist. LEXIS 62114
    , at *14-15 (N.D. Ill.
    June 23, 2010) (excluding expert report related to defendant’s
    financial forecasts in part because expert “did not read any
    testimony about how [defendant] prepared its forecast” and “did
    not even read the deposition transcript” of the head of
    defendant’s forecasting division).
    There are other problems with the reliability of Dr.
    Finkelman’s proposed expert testimony as well. For example, Dr.
    Finkelman has not identified any particular principles or
    methodology he used in forming his opinions. Dr. Finkelman does
    not cite a single study, report, or other source for his
    opinions related to appropriate human-resources policies and
    practices. And, although he opines that Amtrak permitted an
    inappropriate degree of subjectivity in its hiring and promotion
    practices, Dr. Finkelman did not attempt to measure the degree
    of subjectivity at Amtrak. Finkelman Dep., ECF No. 319-3 at 27.
    Indeed, Dr. Dr. Finkelman did not conduct any independent
    research as part of his assessment of Amtrak’s policies. 
    Id. at 22
    . Rather, when asked how he prepared his report, Dr. Finkelman
    testified:
    The process I use, which is the way I normally
    do it is, I go through all the documents
    initially to get a sense of it, and I tend to
    do that rapidly. And then I go back and start
    making determinations as to what fits into a
    report. And that’s exactly the process I used.
    So I start by reading the complaint and the
    40
    answer to the complaint, and then the
    depositions. And I start finding spots in the
    deposition or the declarations that seemed to
    be relevant to what I was asked to do, and
    then I just put that together as a report.
    Finkelman Dep., ECF No. 319-3 at 24; see also 
    id. at 27
    (testifying that his report was “predominantly” based on his
    “review of the deposition testimony of managers as to how it is
    that they make decisions pertaining to hiring and promotion and
    to a lesser degree discipline”); 
    id. at 28
     (confirming that he
    did not read the deposition testimony of managers but instead
    relied on the “selection roulette” document provided by
    plaintiffs’ counsel that summarized the testimony of selected
    managers).
    In short, Dr. Finkelman appears to have uncritically relied
    on documents supplied to him by plaintiffs’ counsel, cited to
    those pieces of evidence that supported his theories, and
    concluded that this selective evidence demonstrates that
    Amtrak’s practices were inconsistent with generally-accepted
    human resource management practices. Finkelman Rep., ECF No.
    304-3 at 25. To the extent that this may be considered a
    methodology at all, it does not meet the standards of
    reliability demanded by Rule 702 or Daubert. See, e.g.,
    Chesapeake Climate Action Network v. Exp.-Imp. Bank of the
    United States, 
    78 F. Supp. 3d 208
    , 219 (D.D.C. 2015) (expert
    testimony inadmissible where expert failed to identify any
    41
    “principles or methodology” used to arrive at his opinions, but
    rather “note[d] only that he reviewed certain documents and
    reached a series of conclusions”); Obrycka v. City of Chicago,
    
    792 F. Supp. 2d 1013
    , 1025 (N.D. Ill. 2011) (excluding expert
    witness who “did not conduct any independent research” to
    prepare his report and who failed to “investigate[] the veracity
    of the materials Plaintiff’s counsel provided to him, or
    request[] additional materials from Plaintiff’s counsel to
    further inform his opinion”).
    3.   Dr. Finkelman’s Opinions Do Not Constitute
    “Generalized Expert Testimony”
    In response to these deficiencies, plaintiffs assert that
    “some of the content” of Dr. Finkelman’s report and testimony
    consists of “explication of the principles” of social science
    that may be admitted as “generalized testimony.” See Pls.’ Opp.
    to Mot. to Exclude Roth and Finkelman (“Pls.’ Roth/Finkelman
    Opp.”), ECF No. 345 at 10-12. Plaintiffs contend that such
    testimony is appropriate because
    it might also be important in some cases for
    an expert to educate the factfinder about
    general principles, without ever attempting to
    apply these principles to the specific facts
    of the case. . . . For this kind of generalized
    testimony, Rule 702 simply requires that: (1)
    the expert be qualified; (2) the testimony
    address a subject matter on which the
    factfinder can be assisted by an expert; (3)
    the testimony be reliable; and (4) the
    testimony ‘fit’ the facts of the case.
    42
    Id. at 11 (quoting Fed. R. Evid. 702 advisory committee notes).
    Plaintiffs do not specify which portions of Dr. Finkelman’s
    report or testimony they seek to admit under this provision. See
    generally Pls.’ Roth/Finkelman Opp., ECF No. 345. Nor do
    plaintiffs address how, precisely, they believe such testimony
    about industrial-organizational psychology, without any
    application to the facts of this case, will assist the Court’s
    class-certification inquiry. Id. Despite plaintiffs’ argument to
    the contrary, Dr. Finkelman’s report says little about the “role
    of unbridled subjectivity in employment selections,” see Pls.’
    Roth/Finkelman Opp., ECF 345 at 12, that is “generalized” and
    does not “attempt[] to apply the[] principles to the specific
    facts of the case,” Fed. R. 702 advisory committee notes. See
    Finkelman Rep., ECF No. 304-3 at 19-25; see also Fox v.
    Pittsburgh State Univ., No. 14-2606, 
    2016 WL 4919463
    , at *3 (D.
    Kan. Sept. 15, 2016) (rejecting defendant’s argument that expert
    was merely offering “generalized testimony” where defendant’s
    aim was to “implicitly apply the[] principles [offered by the
    expert] to the specifics of the case”).
    Moreover, even if the Court were persuaded that Dr.
    Finkelman offers generalized testimony that could be helpful to
    the issue of class certification, plaintiffs have failed to show
    that Dr. Finkelman’s testimony is, at bottom, reliable. As
    explained above, Dr. Finkelman does not cite any studies or
    43
    other data supporting his opinions, and he did not attempt to
    measure the degree of subjectivity in Amtrak’s hiring,
    promotion, or disciplinary decisions. Finkelman Dep., ECF No.
    319-3 at 27. Moreover, Dr. Finkelman does not account for a host
    of information, some of which he admits is relevant to the very
    question he aims to answer. 
    Id. at 22-23, 25, 45
    . Plaintiffs
    argument that the Court should accept Dr. Finkelman’s testimony
    simply because he is “a very knowledge psychologist” and “gets
    it,” Pls.’ Roth/Finkelman Opp., ECF No. 345 at 27, is not only
    conclusory, but also inadmissible ipse dixit in its most classic
    form. See Gen. Elec. Co. v. Joiner, 
    522 U.S. 136
    , 146 (1997);
    Obrycka v. City of Chicago, 
    792 F. Supp. 2d 1013
    , 1025 (N.D.
    Ill. 2011).
    4.   Dr. Finkelman’s Rebuttal Report Does Not Render
    His Analysis Reliable
    Perhaps recognizing the deficiencies in Dr. Finkelman’s
    report, plaintiffs finally contend that, “to the extent there
    were shortcomings in Dr. Finkelman’s initial Expert Report, they
    are removed by his Expert Rebuttal Report” which “specifically
    cit[es] the Industrial-Organizational Psychology studies and
    publications that support his opinions in this case.” Pls.’
    Roth/Finkelman Opp., ECF No. 345 at 28. Although Dr. Finkelman’s
    rebuttal expert report does cite academic literature purportedly
    supporting his opinions, the rebuttal report fails to address
    44
    the fundamental problem with his initial expert report: Dr.
    Finkelman did not review sufficient facts to develop his Amtrak-
    specific expert opinions. Although Dr. Finkelman need not
    “examine every document that was filed in this matter” to opine
    on the adequacy of Amtrak’s human-resource management practices,
    see Finkelman Rebuttal Rep., ECF No. 344-2 at 16, he cannot
    simply rely on cherry-picked facts selected by plaintiffs’
    counsel in forming his opinions. See, e.g., Shawler v. Ergon
    Asphalt & Emulsions, Inc., No. 15-2599, 
    2016 WL 1019121
    , at *11
    (E.D. La. Mar. 15, 2016) (excluding report as unreliable where
    expert simply “cherry-pick[ed] evidence favorable to [plaintiff]
    and dictate[d] what inferences and legal conclusions the Court
    should draw from that evidence”).
    D.   Amtrak’s Motion To Exclude Mr. Roth’s Report and
    Testimony Is Denied
    1.   Mr. Roth’s Qualifications And Opinions
    Thomas R. Roth is a financial and economic advisor to labor
    organizations. See Roth Rep., ECF No. 304-2 ¶ 1. He holds a
    bachelor of science in economics and industrial relations and a
    master of science in labor and industrial relations. Roth Rep.
    Ex. A, ECF No. 304-2 at 15. Mr. Roth has worked with labor
    organizations in a variety of sectors, including — and perhaps
    especially in — the railroad industry. 
    Id.
     Specifically, he has
    represented all fourteen standard railroad unions before the
    45
    Presidential Emergency Board and in arbitration proceedings. 
    Id.
    Indeed, Mr. Roth affirms that he has “been directly and
    intimately involved in every round of collective bargaining at
    Amtrak since 1978.” Decl. & Expert Rebuttal Rep. of Thomas R.
    Roth (“Roth Rebuttal Rep.”), ECF No. 344-1 ¶ 2. Currently, he is
    President of Labor Bureau Inc., a private-consulting firm that
    provides professional services in labor-relations matters. Roth
    Rep. Ex. A, ECF No. 304-2 at 15.
    In his expert report, Mr. Roth classifies the seventeen
    different collective-bargaining units at Amtrak into five
    “functional categories” or “craft groups” that he contends
    “mirror Amtrak’s management structure.” Roth Rep., ECF No. 304-2
    ¶¶ 8-15. He explains that these five functional groups share
    common work sites and supervision, along with certain terms in
    their collective-bargaining agreements. 
    Id. ¶¶ 21-36
    . Based on
    these observations, Mr. Roth opines that “it makes sense” to
    analyze Amtrak’s process for hiring, promoting, and disciplining
    its employees by these functional groups. Dep. of Thomas R. Roth
    (“Roth Dep.”), ECF No. 329-3 at 52, 53-54. Mr. Roth’s opinions
    are based on his personal experience with Amtrak and the labor
    organizations representing its workforce, his general knowledge
    of Amtrak’s operation and the railroad industry, a review of
    certain Amtrak collective bargaining agreements, and “other
    pertinent statistical information” maintained by Mr. Roth or his
    46
    staff. Roth Rep. ECF No. 304-2 ¶ 2; Roth Dep., ECF No. 329-3 at
    5.
    2.   Mr. Roth’s Opinions Are Reliable
    Amtrak argues that Mr. Roth’s report and testimony should
    be excluded because they are unreliable. See Def.’s Mem. in
    Supp. of Mot. to Exclude Roth (“Def.’s Roth Mem.”), ECF No. 329-
    1 at 12-18. First, Amtrak complains that Mr. Roth did not review
    any pleadings, 30(b)(6) testimony, other expert reports, Amtrak
    organizational charts, descriptions of the reporting structure
    at Amtrak, or a host of documents related to specific employment
    decisions made at Amtrak with respect to plaintiffs. 
    Id.
     at 14-
    15. For example, Amtrak points out that Mr. Roth failed to
    review all the collective-bargaining agreements, instead just
    reviewing “one [collective-bargaining agreement] per union” even
    though some unions “have multiple agreements based on
    geographical location . . . and . . . have had several
    applicable agreements during the alleged class period.” 
    Id. at 13
    . Second, Amtrak argues that Mr. Roth’s classifications are
    not reliable because Mr. Roth acknowledged during his deposition
    that the functional categories may not “neatly” describe the
    range of employees in each group. 
    Id. at 16-17
    . And third,
    Amtrak contends that Mr. Roth ignored contradictory information
    and focused only on purported commonalities in examining the
    collective-bargaining agreements. 
    Id. at 17-18
    .
    47
    Plaintiffs respond that Mr. Roth appropriately relied on
    his “deep, thorough, and encyclopedic” knowledge of the railroad
    industry, Amtrak’s unions, and collective-bargaining agreements
    in forming his opinions with respect to the functional
    categories. Pls.’ Roth/Finkelman Opp., ECF No. 345 at 12-13. To
    this end, plaintiffs point out that Amtrak’s criticism that Mr.
    Roth should have “reviewed each and every collective bargaining
    agreement” rings hollow given that Mr. Roth “was an active
    participant in negotiating those same collective bargaining
    agreements.” 
    Id. at 13
    . In addition, plaintiffs argue that,
    notwithstanding Amtrak’s arguments to the contrary, Mr. Roth
    does not purport to opine in his initial expert report that the
    five functional groups should be used to analyze “every
    selection decision, discipline decision, and hostile work
    environment claim for virtually every unionized employee” at
    Amtrak over the class period. 
    Id. at 17
    . Rather, plaintiffs
    claim that Mr. Roth’s report does nothing more than “set[] forth
    the existence, nature, and significance of the Craft Groups at
    Amtrak.” 
    Id.
     Finally, plaintiffs contend that Amtrak’s
    complaints about Mr. Roth’s treatment of variations between
    craft groups do nothing to undermine Mr. Roth’s opinion
    regarding the similarities between the craft groups. 
    Id. at 18
    .
    The Court finds that Amtrak’s objections go to the weight
    to be given to Mr. Roth’s testimony and not its reliability.
    48
    Amtrak does not attack Mr. Roth’s qualifications, and the Court
    finds that Mr. Roth is certainly qualified “by knowledge, skill,
    experience, training, or education.” Fed. R. Evid. 702. Indeed,
    as Mr. Roth’s rebuttal report makes clear, he has “direct and
    thorough” knowledge of collective bargaining in the railroad
    industry and is “specifically” knowledgeable about the craft
    structure that he discusses in his report. Roth Rebuttal Rep.,
    ECF No. 344-1 at 2.
    Moreover, Amtrak has not demonstrated that Mr. Roth’s
    failure to review certain materials — namely, pleadings,
    depositions, other expert reports, personnel files, job
    descriptions, or the entire universe of collective-bargaining
    agreements pertaining to Amtrak unions — has rendered his
    opinions regarding the structure of craft groups at Amtrak so
    unreliable as to be excluded. See Joy v. Bell Helicopter
    Textron, Inc., 
    999 F.2d 549
    , 567 (D.C. Cir. 1993) (admission of
    expert testimony “does not constitute an abuse of discretion
    merely because the factual bases for an expert’s opinion are
    weak”); Stryker Spine v. Biedermann Motech GmbH, 
    684 F. Supp. 2d 68
    , 101 (D.D.C. 2010) (expert’s failure to review certain
    records did not render his opinion unreliable where his opinions
    were based “on his expertise in the relevant field”).
    Mr. Roth’s opinions stand in contrast to those offered by
    Dr. Finkelman. Whereas Dr. Finkelman’s reliance on unverified
    49
    summaries of cherry-picked deposition testimony provided to him
    by plaintiffs’ counsel rendered the foundation of his testimony
    unreliable, Mr. Roth merely relied on fewer “facts” than Amtrak
    prefers. Amtrak is free to challenge the factual bases of Mr.
    Roth’s opinions through “[v]igorous cross-examination” and
    “presentation of contrary evidence,” which are “the traditional
    and appropriate means of attacking shaky but admissible
    evidence.” Daubert, 
    509 U.S. at 596
    . Moreover, the Court can
    determine what weight to afford Mr. Roth’s opinions as part of
    its class-certification analysis. See In re Rail Freight Fuel
    Surcharge Antitrust Litig., No. 07-0489, 
    2017 WL 5311533
    , at *27
    (D.D.C. Nov. 13, 2017) (“The Court may admit expert opinion even
    where — as here — the factual bases for the opinion are weak.
    The Court will determine what weight to afford [the expert’s]
    opinion, given its limited support, under Rule 23.”).
    3.   Mr. Roth’s Opinions May Be Relevant
    Amtrak also argues that, even if Mr. Roth’s testimony is
    reliable, it should still be excluded because “Mr. Roth has no
    basis for concluding that the groupings he identifies are
    relevant to the claims at issue in this case.” Def.’s Roth Mem.,
    ECF No. 329-1 at 19. In particular, Amtrak argues that the
    functional groups set forth in Mr. Roth’s report “are in no way
    based upon the manner in which Amtrak managers make selection
    and discipline decisions” but instead only relate to “collective
    50
    bargaining issues.” 
    Id. at 18-19
    . Contrary to Amtrak’s
    contentions, the Court finds that Mr. Roth’s testimony is
    “sufficiently tied to the facts of this case” such that it will
    aid the factfinder in resolving a factual dispute. Ambrosini v.
    Labarraque, 
    101 F.3d 129
    , 134 (D.C. Cir. 1996). According to Mr.
    Roth, the functional categories are, in fact, appropriate for
    analyzing hiring, promotion, and discipline processes and
    procedures at Amtrak. See Roth Dep., ECF No. 329-3 at 52 (hiring
    procedures and promotion process); id. at 53-54 (disciplinary
    procedures). The parties’ disagreements as to these conclusions
    go to the weight to be given the evidence and not its
    admissibility. See Ambrosini, 
    101 F.3d at 140
     (D.C. Cir. 1996)
    (“Daubert instructs that the admissibility inquiry focuses not
    on conclusions, but on approaches[.]”).
    In short, the Court finds that Mr. Roth’s opinions are
    reliable and relevant to plaintiffs’ class-certification motion
    and should not be excluded.
    E.   Amtrak’s Motion To Exclude Dr. Bradley And Dr. Fox’s
    Report and Testimony Is Denied
    1.   Dr. Bradley And Dr. Fox’s Qualifications And
    Opinions
    Dr. Edwin L. Bradley, Jr. and Dr. Liesel M. Fox are
    statisticians at Quantitative Research Associates, a firm that
    provides statistical and computing consulting services. See
    Bradley/Fox Rep., ECF No. 304-1 at 2-3. Dr. Bradley and Dr. Fox
    51
    were asked to examine the hiring of external job applications,
    selection of internal candidates for promotions and transfers,
    and the disciplinary charges levied and resolved against Amtrak
    employees to ascertain the differences in hiring, promotion, and
    discipline rates between African-American and non-African-
    American employees. Id. at 4. The purpose of this analysis was
    to determine “whether the policies and practices used by Amtrak
    have had adverse impact against its African-American . . .
    employees” between April 4, 1996 and December 31, 2008 (the
    “Analysis Period”). Id.
    To conduct their analysis, Dr. Bradley and Dr. Fox relied
    on certain databases that were prepared by Amtrak from
    electronic data sources at Amtrak (“Joint Databases”). Id. at 5-
    7. The Joint Databases provided information regarding hiring and
    termination dates, rates of pay, changes in job assignment,
    race, records of disciplinary violations, and applicant pools
    for select vacancies. Id. Dr. Bradley and Dr. Fox assigned each
    employee with a record in the Joint Database to one of four
    craft groups based on the employee’s union membership. Id. at 6.
    Dr. Bradley testified that he was instructed to aggregate the
    data based on these craft groups by plaintiffs’ counsel. Bradley
    Dep., ECF No. 331-3 at 5.
    In analyzing hiring and promotion decisions, Dr. Bradley
    and Dr. Fox divided their analysis into two groups: vacancies
    52
    for which they had “applicant flow data” — i.e., information
    regarding pools of individuals who actually applied for
    vacancies between July 2003 and December 2008 — and vacancies
    for which no such data existed. Bradley/Fox Rep., ECF No. 304-1
    at 8-16. For those vacancies for which applicant flow data did
    exist, Dr. Bradly and Dr. Fox compared the selection for each
    job opening against the specific pool of candidates who applied
    for the opening, after removing candidates who were not
    minimally qualified for the position because they, for example,
    failed a drug screen or failed a relevant skills test. Id. at 8-
    9. Dr. Bradley testified that, in his analysis of hiring and
    promotion decisions, he did not control for other types of
    qualifications that could conceivably influence a hiring or
    promotion decision:
    Q. But you don’t try to analyze when you’re
    trying to figure out whether or not a
    component or the overall selection process has
    adverse impact, you don’t consider the types
    of qualifications that a decision-maker might
    have looked at when making the decision, like
    experience and other types of qualifications?
    A. No, I’m not thinking of that. I’m looking
    only at minimum qualifications.
    Bradley Dep., ECF No. 331-3 at 28; see also id. at 56-57
    (testifying that he did not take educational attainment into
    consideration in evaluating hiring or promotion decisions). Dr.
    Bradley also admitted that, although internal candidates were
    53
    “always preferred” in the employment selection process, he did
    not control for that in his analysis of Amtrak’s selection
    process. Id. at 23-24. Based on this analysis, Dr. Bradley and
    Dr. Fox found that there were a total of 6,193 individuals
    selected for vacancies for which there was Applicant Flow Data
    across all craft groups. Bradley/Fox Rep., ECF No. 304-1 at 10.
    Of those, only 2,335 individuals were African-American
    individuals, even though one would have expected 2,589 African-
    American selections based on the proportion of African-American
    candidates in the pool of applicants. Id.
    For the majority of vacancies — approximately 49,000 of
    them — there was no Applicant Flow Data. Id. at 11. For those
    vacancies, Dr. Bradley and Dr. Fox analyzed selections using
    proxy benchmarks based on the vacancies for which applicant data
    did exist to represent African-American availability. Id. at 11-
    12. The same extrapolated benchmark was applied to every
    internal selection or external hire decision within a particular
    craft group. Id. 11-14, 26-27. For the vacancies for which
    Amtrak made external hires, Dr. Bradley and Dr. Fox found that
    there were a total of 10,074 individuals selected across all
    craft groups; of these, only 3,577 of the individuals selected
    were African-American, although 4,312 African-American
    selections were expected based on the benchmarks. Id. at 13.
    With respect to positions that were eventually filled through
    54
    internal promotions rather than external hires, Dr. Bradley and
    Dr. Fox found that there were a total of 39,548 vacancies across
    all craft groups. Id. at 14. Of those, 12,834 were filled by
    African-American individuals, even though one would have
    expected 14,899 African-American selections. Id. In other words,
    Dr. Bradley and Dr. Fox concluded that African-American
    individuals were hired less and selected for fewer competitive
    promotions than their non-African-American counterparts.
    Finally, Dr. Bradley and Dr. Fox analyzed disciplinary
    charges and resulting outcomes for Amtrak employees. Id. at 16-
    17. They found that there were 10,796 employees who were issued
    a total of 24,136 disciplinary charges during the Analysis
    Period. Of those charges, 10,651 charges were issued to 4,175
    African-American employees, even though one would expect only
    8,924 charges to be issued to that group if the disciplinary
    process was race-neutral. Id. at 16. Dr. Bradley and Dr. Fox
    also found that African-American employees were terminated and
    received formal reprimands or deferred suspensions at
    statistically higher rates than non-African-American employees.
    Id. at 17. Based on their review, Dr. Bradley and Dr. Fox
    concluded that African-American employees were charged with
    disciplinary violations at a rate higher than their non-African-
    American counterparts. Id.
    55
    2.   The Bradley/Fox Report Is Sufficiently Reliable
    Amtrak does not dispute that Dr. Bradley and Dr. Fox are
    qualified to offer statistical expert testimony. Instead, Amtrak
    argues that the Court should not consider Dr. Bradley and Dr.
    Fox’s expert report and testimony because their opinions are
    unreliable. Amtrak’s argument focuses on Dr. Bradley and Dr.
    Fox’s use of extrapolated benchmarks to assess racial
    disparities in Amtrak’s hiring and promotional decisions. Def.’s
    Mem. in Supp. Mot. to Exclude Bradley and Fox (Def.’s
    Bradley/Fox Mem.”), ECF No. 331-1 at 26-32. Specifically, Amtrak
    argues that, before extrapolating benchmarks for African-
    American hiring and promotion from the applicant flow data, Dr.
    Bradley and Dr. Fox were required to ensure that the applicant
    flow data was representative of the applicant pool to which the
    extrapolated benchmarks would apply. Id. at 28-29. Amtrak also
    argues that Dr. Bradley and Dr. Fox did not assess whether the
    sample size was sufficient to extrapolate the benchmarks. Id. at
    29. Finally, Amtrak contends that Dr. Bradley and Dr. Fox erred
    by treating each benchmark as an “exact, known value” rather
    than “a sample estimate within a margin of error.” Id. at 29-30.
    While Amtrak points to potential problems with Dr. Bradley
    and Dr. Fox’s extrapolation techniques, it fails to establish
    that these experts used a methodology so unreliable as to
    warrant exclusion of their report. There is no evidence that Dr.
    56
    Bradley and Dr. Fox cherry-picked the data points in
    constructing the benchmarks for African-American availability
    where that data was not kept in the regular course by Amtrak. It
    is, of course, clear that the experts’ extrapolated benchmarks
    in areas where no applicant flow data was available is less
    precise than Amtrak’s actual applicant flow data. It is also
    clear, however, that plaintiffs may rely on reliable estimates
    when actual data is unavailable. See General Elec. Co. v.
    Joiner, 
    522 U.S. 136
    , 146 (1997) (stating the well-established
    principle that “[t]rained experts commonly extrapolate from
    existing data”); see generally Ramona L. Paetzold & Steven L.
    Willborn, The Statistics of Discrimination: Using Statistical
    Evidence in Discrimination Cases § 4.03 (2014) (describing the
    use of proxy data when actual data is unavailable or
    unreliable). It may be that Dr. Bradley and Dr. Fox’s sample
    size of approximately 6,200 was too small, and perhaps a larger
    sample would have revealed fewer differences between the hiring
    and promotion of African-American individuals as compared to
    their non-African-American counterparts. Such a criticism can be
    brought out in cross-examination and does not render Dr. Bradley
    and Dr. Fox’s methodology so unreliable that it should not be
    admitted. See, e.g., Equal Emp’t Opportunity Comm’n v. Texas
    Roadhouse, Inc., 
    215 F. Supp. 3d 140
    , 155 (D. Mass. 2016) (“Even
    when statistical analysis has involved general population census
    57
    data to show discriminatory intent, it has not been precluded on
    Fed. R. Evid. 702 grounds.”).
    3.   The Bradley/Fox Report Has Limited Probative
    Value
    Amtrak spends the bulk of its brief arguing that
    plaintiffs’ statistical evidence is irrelevant to its class-
    certification motion because Dr. Bradley and Dr. Fox did not
    study a particular employment practice or the decisions of any
    common decision-maker. See Def.’s Bradley/Fox Mem. ECF No. 331-1
    at 9-26. As such, Amtrak argues that Dr. Bradley and Dr. Fox’s
    analysis will be unhelpful to the trier of fact because these
    experts cannot opine that any specific employment practice
    caused the alleged statistical disparities. 
    Id. at 16
    . Amtrak
    notes that plaintiffs’ experts could have utilized the job files
    produced in discovery that contained candidate records,
    applications, selection criteria, rating sheets, and other
    records relating to each of the selections contained in the
    Joint Database. 
    Id. at 7, 11, 36
    .
    Plaintiffs respond that the components of Amtrak’s
    selection process “were not able to be separated for analysis
    because they were interwoven and overlapping parts of a singular
    process.” Pls.’ Opp. to Mot. to Exclude Bradley and Fox, ECF No.
    342 at 10-15. Plaintiffs further claim that data to do such an
    analysis was not available. 
    Id. at 10, 15-21
    .
    58
    Plaintiffs bear the initial burden of making out a prima
    facie case of discrimination. Cooper v. Fed. Reserve Bank of
    Richmond, 
    467 U.S. 867
    , 874 (1984). And because plaintiffs
    allege a system-wide pattern or practice of discrimination,
    plaintiffs have “to prove more than the mere occurrence of
    isolated or ‘accidental’ or sporadic discriminatory acts.” Int’l
    Bhd. of Teamsters v. United States, 
    431 U.S. 324
    , 336 (1977).
    Rather, plaintiffs have “to establish by a preponderance of the
    evidence” that racial discrimination was Amtrak’s “standard
    operating procedure — the regular rather than the unusual
    practice.” 
    Id.
    In a case such as this, then, statistical data is relevant
    because it can be used to establish a general discriminatory
    pattern in an employer’s hiring or promotion practices. As the
    Supreme Court explained,
    [s]tatistics   showing    racial   or   ethnic
    imbalance are probative . . . because such
    imbalance is often a telltale sign of
    purposeful       discrimination;        absent
    explanation, it is ordinarily to be expected
    that nondiscriminatory hiring practices will
    in time result in a work force more or less
    representative of the racial and ethnic
    composition of the population in the community
    from   which   the    employees   are   hired.
    Considerations such as small sample size may,
    of course, detract from the value of such
    evidence, and evidence showing that the
    figures for the general population might not
    accurately reflect the pool of qualified job
    applicants would also be relevant.
    59
    Int’l Bhd. of Teamsters, 
    431 U.S. at 340
    . Importantly, in most
    cases in which plaintiffs allege a disparate impact, plaintiffs
    must do more than simply “show that there are statistical
    disparities in the employer’s work force.” Watson v. Fort Worth
    Bank & Trust, 
    487 U.S. 977
    , 994 (1988). Rather, plaintiffs are
    responsible for “isolating and identifying the specific
    employment practices that are allegedly responsible for any
    observed statistical disparities.” 
    Id.
    In this respect, plaintiffs’ statistical evidence suffers
    from a number of shortcomings. For example, Dr. Bradley admitted
    that he did not study whether a particular employment practice
    at Amtrak caused an adverse impact. Bradley Dep., ECF No. 331-3
    at 27. Moreover, although plaintiffs’ claim that Amtrak’s
    employment practices are “incapable of being separated for
    analysis” and therefore subject to a bottom-line analysis as to
    disparate impact, 42 U.S.C. § 2000e—2(k)(1)(B)(i), Dr. Bradley
    and Dr. Fox’s report does nothing to demonstrate this fact.
    Their report does not grapple with the data contained in
    Amtrak’s job files or explain how it was inadequate to render a
    statistical analysis as to a particular employment practice.
    Nonetheless, although the statistical study proffered by
    plaintiffs’ experts may, ultimately, be inadequate to satisfy
    plaintiffs’ burden on the merits, the Court declines to exclude
    it as irrelevant at this time. As other courts have found, a
    60
    “statistical study may fall short of proving the plaintiff’s
    case, but still remain relevant to the issues in dispute.” Obrey
    v. Johnson, 
    400 F.3d 691
    , 695 (9th Cir. 2005). For example, in
    Obrey, the defendant challenged the admission of the plaintiff’s
    expert report because, inter alia, the statistical analysis was
    irrelevant to plaintiff’s claims that the defendant engaged in
    discriminatory hiring practices. 
    Id. at 694
    . The statistical
    analysis in that case only analyzed the race of the managers
    selected by the employer as compared to the race of those who
    applied for managerial positions — and, just like in this case,
    did not take into account the relative qualifications of the
    applicant pool or evaluate any specific employment practice. 
    Id. at 694-698
    . While this evidence “by itself” could not
    “constitute proof that the [employer] has discriminated against
    [the plaintiff],” the court explained that “it should have been
    admitted for whatever probative value it had.” 
    Id. at 697
    . In
    other words, “defendant’s objections to the admission of [the
    statistical evidence] went to weight and sufficiency rather than
    admissibility.” Id.; see also, e.g., Puffer v. Allstate Ins.
    Co., 
    255 F.R.D. 450
    , 462 (N.D. Ill. 2009) (although plaintiff’s
    statistical expert “fail[ed] to link any pay differential that
    she found to any [employer] policy or practice,” that deficiency
    did not render the report “irrelevant” but rather simply limited
    61
    its probative value). Accordingly, the Court declines to exclude
    Dr. Bradley and Dr. Fox’s testimony or report.
    IV.   EXCLUSION OF OTHER EVIDENCE
    Amtrak has also moved to strike portions of the
    declarations submitted by plaintiffs in support of their request
    for class certification. Def.’s Mot. to Strike Decls. Of Pls.,
    ECF No. 330. Plaintiffs oppose that motion, arguing both that
    the admissibility standards on which Amtrak relies are
    inapplicable at the class-certification stage, and that, in any
    event, the evidence is admissible. Pls.’ Opp. to Mot. to Strike
    Decls. Of Pls., ECF No. 340.
    Although the Supreme Court has not directly addressed the
    issue of whether evidence proffered in support of a motion for
    class certification must be admissible if it is to be considered
    by the court in determining class certification, its dicta in
    Eisen v. Carlisle & Jacuelin, 
    417 U.S. 156
     (1974), led some
    courts to find that lax evidentiary standards were appropriate. 3
    3    On September 14, 2017, a petition for writ of certiorari
    was filed presenting this precise question – to wit, “[w]hether
    a district court may certify a class action based on information
    that does not meet the standards of admissibility set forth in
    the Federal Rules of Evidence and Civil Procedure.” See Notice
    of Filing of Petition for a Writ of Certiorari, Taylor Farms
    Pac., Inc. v. Pena, No. 15-15965 (9th Cir. Sept. 14, 2017), ECF
    No. 57 Ex. A at 2. The Supreme Court denied the petition for
    writ of certiorari on February 20, 2018. See Taylor Farms
    Pacific, Inc. v. Pena, No. 17-395.
    62
    In Eisen, the Supreme Court emphasized that a court’s decision
    at the class-certification stage “is not accompanied by the
    traditional rules and procedures applicable to civil trials.”
    
    Id. at 178
    . This statement came in the context of the Court’s
    oft-cited conclusion — arrived at in the course of overruling a
    district court’s decision to direct a defendant to cover some of
    the costs of providing notice to the class on the basis that
    plaintiffs were likely to succeed on the merits — that “[w]e
    find nothing in either the language or history of Rule 23 that
    gives a court any authority to conduct a preliminary inquiry
    into the merits of a suit in order to determine whether it may
    be maintained as a class action.” 
    Id. at 177
    .
    Relying upon the statement regarding the absence of
    “traditional rules and procedures” at the class-certification
    stage, the D.C. Circuit held in an unpublished opinion that the
    rules of evidence do not apply at the class-certification stage.
    See In re Rand Corp., No. 02-8007, 
    2002 WL 1461810
    , at *1 (D.C.
    Cir. July 8, 2002) (“[T]he propriety of a district court’s
    refusal to scrutinize for admissibility and probative value
    evidence proffered to demonstrate that the requirements of
    Federal Rule of Civil Procedure 23(a) are satisfied is well-
    settled”). District courts, as plaintiffs recite, came to
    similar conclusions. See, e.g., Disability Rts. Council v. Wash.
    Metro. Area Transit Auth., 
    239 F.R.D. 9
     (D.D.C. 2006).
    63
    The Supreme Court’s decisions in Dukes and Comcast,
    however, have since shifted this landscape. In Dukes, the
    Supreme Court made clear that “[a] party seeking class
    certification must affirmatively demonstrate his compliance with
    [Rule 23] — that is, he must be prepared to prove that there are
    in fact sufficiently numerous parties, common questions of law
    or fact, etc.” Wal-Mart Stores, Inc. v. Dukes, 
    564 U.S. 338
    , 350
    (2011). The Court further explained that the “rigorous analysis”
    a district court must perform of a plaintiffs’ claim for
    certification “‘[f]requently . . . will entail some overlap with
    the merits of the plaintiff’s underlying claim.’” 
    Id. at 351
    .
    The Court elaborated:
    A statement in one of our prior cases, Eisen
    v. Carlisle & Jacquelin, 
    417 U.S. 156
    , 177
    (1974), is sometimes mistakenly cited to the
    contrary: ‘We find nothing in either the
    language or history of Rule 23 that gives a
    court any authority to conduct a preliminary
    inquiry into the merits of a suit in order to
    determine whether it may be maintained as a
    class action.’ But in that case, the judge had
    conducted a preliminary inquiry into the
    merits of a suit, not in order to determine
    the propriety of certification under Rule
    23(a) and (b) . . . but in order to shift the
    cost of notice required by Rule 23(c)(2) from
    the plaintiff to the defendants. To the extent
    the   quoted   statement   goes   beyond   the
    permissibility of a merits inquiry for any
    other pretrial purpose, it is the purest
    dictum and is contradicted by our other cases.
    
    Id.
     351 n.6.
    64
    In Comcast, the Supreme Court reiterated the importance of
    considering all merits questions that may bear on any of the
    Rule 23 factors. See Comcast Corp. v. Behrend, 
    569 U.S. 27
    , 35
    (2013). In so doing, the Court reiterated the requirement that a
    party seeking certification affirmatively demonstrate compliance
    with Rule 23 “through evidentiary proof.” 
    Id. at 33
    . The D.C.
    Circuit has recognized that, post-Comcast, “[i]t is now
    indisputably the role of the district court to scrutinize the
    evidence before granting certification, even when doing so
    ‘requires inquiry into the merits of the claim.’” In re Rail
    Freight Fuel Surcharge Antitrust Litig., 
    725 F.3d 244
    , 253 (D.C.
    Cir. 2013) (quoting Comcast, 
    569 U.S. at 35
    ).
    These cases do not address the precise question before the
    Court — i.e., whether class-certification evidence must meet the
    standards of admissibility as set forth in the Federal Rules of
    Evidence. Moreover, although the Supreme Court granted
    certiorari in Comcast to decide “[w]hether a district court may
    certify a class action without resolving whether the plaintiff
    class had introduced admissible evidence,” it ultimately did not
    decide that question because defendants had failed to raise an
    appropriate objection on that ground before the trial court and
    thus forfeited the issue. Comcast, 
    569 U.S. at
    33 n.4. These
    decisions suggest, however, that when a party objects to
    evidence provided in support of class certification, a district
    65
    court must assess the admissibility of that evidence before
    certifying a class. As such, the Court concludes that, to the
    extent it relies on any controverted portions of plaintiffs’
    proffered declarations to support its class-certification
    ruling, it must first address Amtrak’s evidentiary objections. 4
    Accordingly, in the course of its analysis, the Court will
    resolve Amtrak’s objections to the portions of plaintiffs’
    declarations that the Court relies on in reaching its class-
    certification decision. To the extent the Court does not rely on
    the declarations, the Court will not address Amtrak’s
    evidentiary objections, and Amtrak must re-raise them in future
    proceedings.
    4    Although this holding conflicts with the D.C. Circuit’s
    unpublished decision in In re Rand, No. 02-8007, 
    2002 WL 1461810
    , at *1 (D.C. Cir. July 8, 2002), the Court concludes
    that it is not bound by that decision. For one, unpublished
    decisions “‘should not strictly bind panels’ of the court of
    appeals and are often not ‘suitable for governing future cases’
    given that they neither reach the merits nor benefit from oral
    argument.” Martin v. Dist. of Columbia, 
    78 F. Supp. 3d 279
    , 308
    n.36 (D.D.C. 2015) (quoting In re Grant, 
    635 F.3d 1227
    , 1232
    (D.C. Cir. 2011)). The persuasiveness of such a disposition is
    further undermined where, as here, subsequent doctrinal changes
    have significantly altered the landscape. See 
    id.
     (noting as an
    additional reason not to be bound by an unpublished disposition
    the fact that “the tides have changed in the last seventeen
    years” regarding the legal doctrine at issue).
    66
    V.   CLASS CERTIFICATION
    “The class action is ‘an exception to the usual rule that
    litigation is conducted by and on behalf of the individual named
    parties only.’” Comcast Corp. v. Behrend, 
    569 U.S. 27
    , 33 (2013)
    (citation omitted). Class certification is governed by Federal
    Rule of Civil Procedure 23, which requires a plaintiff to
    demonstrate that the requirements of Rule 23(a) are met and that
    the class is maintainable pursuant to one of Rule 23(b)’s
    subdivisions. See Richards v. Delta Air Lines, Inc., 
    453 F.3d 525
    , 529 (D.C. Cir. 2006).
    The D.C. Circuit has made clear that class certification
    “is far from automatic.” In re Rail Freight Fuel Surcharge
    Antitrust Litig., 
    725 F.3d 244
    , 249 (D.C. Cir. 2013). Rather, a
    plaintiff seeking certification of a class must “affirmatively
    demonstrate his compliance” with the requirements of Rule 23.
    Wal-Mart Stores, Inc. v. Dukes, 
    564 U.S. 338
    , 350 (2011). This
    is done not by pleading compliance with Rule 23, but by
    demonstrating “compliance . . . in fact.” 
    Id.
     At times,
    determining whether the proponent of a class has satisfied the
    requirements of Rule 23 “resembles an appraisal of the merits,
    for ‘it may be necessary for the court to probe behind the
    pleadings before coming to rest on the certification question.’”
    In re Rail Freight Fuel Surcharge Antitrust Litig., 725 F.3d at
    244 (citation omitted). The Court may not, however “consider
    67
    merits questions that do not overlap with Rule 23’s
    requirements.” Coleman through Bunn v. Dist. of Columbia, 
    306 F.R.D. 68
    , 77 (D.D.C. 2015). “Ultimately, the district court’s
    determination must rest on a ‘rigorous analysis’ to ensure that
    all the requirements are satisfied, and ‘[a]ctual, not presumed,
    conformance’ with Rule 23 is indispensable.” Burton v. Dist. of
    Columbia, 
    277 F.R.D. 224
    , 228 (D.D.C. 2011) (citation omitted). 5
    5    Because Amtrak filed both an opposition to plaintiffs’
    motion for class certification and its motion for summary
    judgment on the same day, it bears noting that “the order of
    disposition of motions for summary judgement and class
    certification” is “a question of discretion for the trial
    court.” Curtin v. United Airlines, Inc., 
    275 F.3d 88
    , 92 (D.C.
    Cir. 2001). Rule 23(c)(1)(A) directs the court to determine
    “[a]t an early practicable time” whether to certify a class
    action, and “it is often more efficient and fairer to the
    parties to decide the class question first,” Curtin, 
    275 F.3d at 92
    ; see also Am. Pipe & Const. Co. v. Utah, 
    414 U.S. 538
    , 547-49
    (1974) (noting that the 1966 amendment to Rule 23 requiring a
    court to decide the class-certification question “as soon as
    practicable” was designed, in part, to curtail the abusive
    practice of one-way intervention). The advisory committee notes
    to Rule 23 recognize, however, that a decision on summary
    judgment may be appropriate prior to a certification ruling in
    certain circumstances. See Fed. R. Civ. P. 23 advisory committee
    notes (“Other considerations may affect the timing of the
    certification decision. The party opposing the class may prefer
    to win dismissal or summary judgment as to the individual
    plaintiffs without certification and without binding the class
    that might have been certified.”). Here, the Court will follow
    the ordinary course and will first address plaintiffs’ motion
    for a class certification before addressing the legal merits of
    plaintiffs’ claims under section 1981 and Title VII.
    68
    A.   Plaintiffs’ Proposed Classes
    The named plaintiffs in this case are seventy-one African-
    American Amtrak employees, former Amtrak employees, or
    applicants for employment at Amtrak. Plaintiffs move to certify
    the following classes or, in the alternative, subclasses:
    (1) All Black employees of Amtrak who are
    represented   for    purposes   of   collective
    bargaining by any labor union (except those
    who have worked only in the Northeast Corridor
    and are represented for purposes of collective
    bargaining by the Pennsylvania Federation of
    the   Brotherhood   of   Maintenance   of   Way
    Employees) (herein, “Black CBA employees”)
    who,   since   April   4,   1996,   have   been
    discriminated against because of their race or
    color in regard to competitive promotion
    selections; and/or in the alternative,
    (a) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Shop Crafts who raise
    such promotion selection claims;
    (b) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Engineering Crafts who
    raise such promotion selection claims;
    (c) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Operating and Police
    Crafts who raise such promotion selection
    claims;
    (d) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Clerical and On-Board
    Services Crafts who raise such promotion
    selection claims;
    (2) All Black CBA employees of Amtrak who,
    since April 4, 1996, have been exposed to a
    racially hostile work environment, as embodied
    69
    in    racial    harassment    and/or   racial
    discrimination in regard to training, job
    assignments,     work    assignments,    non-
    competitive transfers, scheduling, and other
    terms and conditions of employment; and/or in
    the alternative,
    (a) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Shop Crafts and have been
    exposed to such a racially hostile work
    environment;
    (b) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Engineering Crafts and
    have been exposed to such a racially hostile
    work environment;
    (c) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Operating and Police
    Crafts and have been exposed to such a
    racially hostile work environment;
    (d) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Clerical and On-Board
    Services Crafts and have been exposed to such
    a racially hostile work environment;
    (3) All Black CBA employees of Amtrak who,
    since April 4, 1996, have been discriminated
    against   in   regard    to   discipline  or
    termination; and/or in the alternative,
    (a) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Shop Crafts and have been
    discriminated against in regard to discipline
    or termination;
    (b) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Engineering Crafts and
    have been discriminated against in regard to
    discipline or termination;
    70
    (c) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Operating and Police
    Crafts and have been discriminated against in
    regard to discipline or termination;
    (d) a subclass of all Black CBA employees
    who, since April 4, 1996, have worked for
    Amtrak in any of the Clerical and On-Board
    Services Crafts and have been discriminated
    against   in    regard   to   discipline    or
    termination; and
    (4) All Black CBA who have applied to work for
    Amtrak for any position(s) that would be
    represented   for   purposes   of   collective
    bargaining by any labor union since April 4,
    1996, and been denied employment because of
    their race.
    Pls.’ Mot. for Class Cert., ECF No. 303 at 1-3.
    B.   Plaintiffs’ Proposed Classes And Subclasses Are
    Impermissibly Fail-Safe
    Although not specifically mentioned in Rule 23, there is an
    “implied requirement” that the class be “adequately defined” and
    “clearly ascertainable” before it can be certified. Thorpe v.
    Dist. of Columbia, 
    303 F.R.D. 120
    , 139 (D.D.C. 2014) (citation
    omitted). This “common-sense requirement” demands that the
    plaintiff “be able to establish [that] the general outlines of
    the membership of the class are determinable at the outset of
    the litigation.” 
    Id.
     (citation omitted); see also, e.g., Johnson
    v. Dist. of Columbia, 
    248 F.R.D. 46
    , 52 (D.D.C. 2008) (“It is
    axiomatic that for a class action to be certified a ‘class’ must
    exist.”); In re Rail Freight Fuel Surcharge Antitrust Litig.,
    No. 07-0489, 
    2017 WL 5311533
    , at *51 (D.D.C. Nov. 13, 2017)
    71
    (explaining that an “implied” requirement of Rule 23 is that the
    putative class be “‘sufficiently defined so as to be
    identifiable as a class’”) (citation omitted). “Accordingly, a
    class may be certified only when ‘an individual would be able to
    determine, simply by reading the [class] definition, whether he
    or she [is] a member of the proposed class.’” Artis v. Yellen,
    
    307 F.R.D. 13
    , 23 (D.D.C. 2014) (citation omitted).
    One aspect of this requirement that the class be adequately
    defined is that it not be a “fail-safe class” — i.e., that the
    class definition not depend on the merits of the underlying
    claim. See, e.g., McCaster v. Darden Rests., Inc., 
    845 F.3d 794
    ,
    799 (7th Cir. 2017) (a fail-safe class is one that “‘is defined
    so that whether a person qualifies as a member depends on
    whether the person has a valid claim’”) (citation omitted);
    Young v. Nationwide Mut. Ins. Co., 
    693 F.3d 532
    , 538 (6th Cir.
    2012) (defining a fail-safe class as “a class that cannot be
    defined until the case is resolved on its merits”). A fail-safe
    class is impermissible because “a class member either wins or,
    by virtue of losing, is defined out of the class and is
    therefore not bound by the judgment.” Messner v. Northshore
    Univ. HealthSystem, 
    669 F.3d 802
    , 825 (7th Cir. 2012). Moreover,
    by “‘[u]sing a future decision on the merits to specify the
    scope of the class,’” a fail-safe class definition “‘makes it
    impossible to determine who in in the class until the case
    72
    ends.’” Artis v. Yellen, 
    307 F.R.D. 13
    , 24 (D.D.C. 2014)
    (quoting Bolden v. Walsh Const. Co., 
    688 F.3d 893
    , 895 (7th Cir.
    2012)); see also Williams v. Glickman, No. 95-1149, 
    1997 WL 33772612
    , at *4 (D.D.C. Feb. 14, 1997) (class not clearly
    defined because, to ascertain class membership, the court would
    be required to “answer several fact-intensive questions”).
    Plaintiffs move to certify the following classes:
    (1) All Black CBA employees who . . . have
    been discriminated against because of their
    race or color in regard to competitive
    promotion selections;
    (2) All Black CBA employees who . . . have
    been exposed to a racially hostile work
    environment, as embodied in racial harassment
    and/or racial discrimination, in regard to
    training, job assignments, work assignments,
    non-competitive transfers, scheduling, and
    other terms and conditions of employment;
    (3) All Black CBA employees who . . . have
    been discriminated against in regard to
    discipline or termination; and/or in the
    alternative,
    (4) All Black CBA who have applied to work for
    Amtrak for any position(s) that would be
    represented   for   purposes   of   collective
    bargaining by any labor union . . . and been
    denied employment because of their race.
    Pls.’ Mot. to Certify Class, ECF No. 303 at 1-3 (emphases
    added).
    Each of these proposed class definitions makes membership
    in the class contingent on individualized merits determinations
    as to whether the individual suffered discrimination because of
    73
    his race, was exposed to racial harassment and/or racial
    discrimination, or was denied employment because of his race. In
    other words, to determine whether any individual is a member of
    one of these putative classes, the Court would be required to
    answer a critical question that goes directly to the merits of
    the litigation: did the individual suffer racial discrimination
    at the hands of Amtrak?
    Moreover, should the Court or a jury conclude that Amtrak’s
    employment decisions were not based on race, plaintiffs’
    proposed classes would contain no members. Each of the supposed
    class members would then be free to file new lawsuits
    attributing their adverse employment decisions to some other
    impermissible criteria, thereby depriving the judgment of any
    preclusive effect. See, e.g., Bolden v. Walsh Const. Co., 
    688 F.3d 893
    , 895 (7th Cir. 2012) (class defined as persons who did
    not earn more “because of their race” made “it impossible to
    determine who was in the class until the case ends,” creating
    the prospect that, if the employer prevailed on the merits, any
    former worker “could file a new suit, given that the losing
    ‘class’ lacked any members”); Lucas v. Vee Pak, Inc., 
    68 F. Supp. 3d 870
    , 880 (N.D. Ill. 2014) (“All variations set forth in
    the complaint beg the question of liability, in that the class
    is made up of certain African—American workers who were not
    hired ‘because of their race.’ It is therefore a ‘fail-safe’
    74
    class: ‘one that is defined so that whether a person qualifies
    as a member depends on whether the person has a valid claim.’”)
    (citation omitted).
    The parties have failed to address these problems with
    plaintiffs’ class definition, perhaps because the problems are
    repairable. Plaintiffs could, for example, redefine their
    classes so that membership is not contingent on whether the
    individual suffered racial discrimination. Cf. Messner, 669 F.3d
    at 825 (“Defining a class so as to avoid, on one hand, being
    over-inclusive and, on the other hand, the fail-safe problem is
    more of an art than a science. Either problem can and often
    should be solved by refining the class definition rather than by
    flatly denying class certification on that basis.”); In re
    AutoZone, Inc., Wage & Hour Emp’t Practices Litig., 
    289 F.R.D. 526
    , 546 (N.D. Cal. 2012)(“Rather than denying certification on
    the basis of the fail-safe definition, the Court would have
    discretion here to redefine the class as ‘all employees who
    sought and did not receive reimbursement for mileage,’ which
    seems to avoid both ascertainability problems. This problem is
    therefore not insurmountable.”). Accordingly, in the interest of
    judicial economy, the Court will address the parties’ arguments
    regarding the requirements of Rule 23.
    75
    C.   Plaintiffs Have Failed to Demonstrate That The
    Proposed Class Action Satisfies The Commonality
    Requirement Of Rule 23(a)
    A plaintiff seeking class certification must establish that
    “there are questions of law or fact common to the class.” Fed.
    R. Civ. P. 23(a)(2). The Supreme Court’s decision in Wal-Mart
    Stores, Inc. v. Dukes, 
    564 U.S. 338
     (2011), “changed the
    landscape” that the district court must navigate when
    considering whether a putative class action satisfies Rule
    23(a)’s commonality requirement. D.L. v. Dist. of Columbia, 
    713 F.3d 120
    , 126 (D.C. Cir. 2013). In Dukes, the plaintiffs alleged
    that Wal-Mart discriminated against female employees by denying
    them equal pay or promotions as compared with male employees.
    
    564 U.S. at 343
    . Specifically, the plaintiffs claimed that their
    local managers’ discretion over pay and promotions was exercised
    disproportionately in favor of men, leading to an unlawful
    disparate impact on, and disparate treatment of, female
    employees. 
    Id. at 344-45
    . The plaintiffs claimed that this
    discrimination was “common to all Wal-Mart’s female employees”
    and that “a strong and uniform ‘corporate culture’ permit[ted]
    bias against women to infect, perhaps subconsciously, the
    discretionary decisionmaking of each one of Wal-Mart’s thousands
    of managers.” 
    Id. at 345
    .
    The district court certified a class consisting of Wal-
    Mart’s female employees who “have been or may be subjected to
    76
    Wal-Mart’s challenged pay and management track promotions
    policies and practices.” 
    Id. at 346
    . The Court of Appeals for
    the Ninth Circuit substantially affirmed, but the Supreme Court
    reversed, denying class certification for failure to satisfy the
    commonality requirement of Rule 23(a)(2). 
    Id. at 345-59
    .
    In so doing, the Supreme Court first explained that Rule
    23’s commonality requirement “is easy to misread, since any
    competently crafted class complaint literally raises common
    ‘questions.’” 
    Id. at 349
     (citation and internal quotation marks
    omitted). Commonality requires more than common questions; it
    requires “the plaintiff to demonstrate that the class members
    ‘have suffered the same injury.’” 
    Id. at 350
     (quoting Gen. Tel.
    Co. v. Falcon, 
    457 U.S. 147
    , 157 (1982)). In other words, the
    claims of the putative class members “must depend upon a common
    contention” that is “of such a nature that it is capable of
    classwide resolution” — i.e., “that determination of its truth
    or falsity will resolve an issue that is central to the validity
    of each one of the claims in one stroke.” 
    Id.
     The Dukes
    plaintiffs identified only a general policy “of allowing
    discretion by local supervisors over employment matters” —
    effectively “a policy against having uniform employment
    practices.” Id. at 355. Resolution of the legality of any one
    manager’s exercise of discretion, then, would have no bearing on
    the legality of any other manager’s action, absent “some glue
    77
    holding the alleged reasons for all those decisions together.”
    Id. at 351. The Supreme Court noted that such glue could be
    provided “if the employer ‘used a biased testing procedure’” or
    upon “‘[s]ignificant proof that an employer operated under a
    general policy of discrimination.’” Id. at 353 (quoting Falcon,
    
    457 U.S. 159
     n.15).
    Plaintiffs do not seriously contend that they can
    demonstrate commonality under Falcon’s first scenario here.
    While plaintiffs assert that “a biased testing procedure” need
    not be limited to “paper-and-pencil tests” and suggest that
    Amtrak’s “selection interview process, ratings, rank-orderings,
    input from other managers, amorphous decision making, and the
    disqualifying discipline criterion” all qualify, plaintiffs give
    that argument short shrift, and with good reason. See Pls.’ Mem.
    in Supp. of Mot. for Class Cert. (“Pls.’ Class Cert. Mem.”), ECF
    No. 303 at 25. For one, plaintiffs nowhere explain how some of
    these practices — for example, “amorphous decision making” or
    seeking “input from other managers” before hiring or promoting
    individuals — can be considered “non-subjective” criteria. 
    Id.
    Even if they had, plaintiffs do not allege, much less
    demonstrate, that all members of the putative class were subject
    to the same set of objective procedures or policies. To the
    contrary, the evidence shows that the interview process,
    assignment of ratings, and rank orderings varied depending on
    78
    the position and the panel of interviewers involved. See, e.g.,
    Ray Decl., ECF No. 322-5 ¶¶ 11-41; Wu Decl., ECF No. 322-8 ¶ 4;
    Allan Decl., ECF No. 321-3 ¶ 5.
    Moreover, plaintiffs do not explain with any detail how any
    such policies “operated in a biased way.” Burton v. Dist. of
    Columbia, 
    277 F.R.D. 224
    , 229 (D.D.C. 2011) (plaintiffs
    allegation that defendant “used a biased testing procedure” was
    insufficient where plaintiffs provided no “detail about how
    those examinations operated in a biased way”); see also Ross v.
    Lockheed Martin Corp., 
    267 F. Supp. 3d 174
    , 197-98 (D.D.C.
    2017)(despite plaintiffs’ assertion that defendant’s
    “companywide evaluation method” resulted in employee ratings
    that were “poorly correlated with job performance,” plaintiffs
    did not provide “an account of how those procedures themselves
    resulted in the racially disparate outcome that Plaintiffs have
    observed in [defendant]’s overall workforce”).
    Plaintiffs’ theories of commonality under Falcon’s second
    scenario are far from clear. Plaintiffs acknowledge that
    Amtrak’s express policies forbid racial discrimination and
    retaliation. Pls.’ Class Cert. Mem., ECF No. 303 at 14. Instead,
    plaintiffs argue that “Amtrak’s centrally-imposed policies,
    practices, and procedures,” while uniform and racially-neutral,
    were open to “variations in practice” by supervisors which led
    to racial bias in employment decisions. 
    Id. at 26
    ; see also 
    id.
    79
    at 24 (asserting that “all of Amtrak’s employment policies are
    entirely uniform nationwide, but are poorly implemented”); 
    id. at 30
     (there were “deviations or variations” from “commonly
    applicable procedures” that permitted “the influx of racially
    discriminatory bias”); 
    id. at 7
     (“Depositions of scores of
    Amtrak managers reflected that the standard selection process
    was followed throughout the country across all crafts; however,
    they also revealed numerous variations which allowed for the
    infusion of subjective qualities.”).
    Stated this way, plaintiffs’ theory of commonality rests on
    the contention that Amtrak allowed lower-level employees to
    deviate from standard policies, which resulted in employment
    decisions being infected by bias. This theory is the same as the
    theory of commonality rejected in Dukes. Compare Pls.’ Class
    Cert. Mem., ECF No. 303 at 26 (“Plaintiffs here show the pattern
    or practice [of racial discrimination] by demonstrating that
    Amtrak’s centrally-imposed policies, practices, and procedures
    were in place and implemented throughout Amtrak’s system, that
    Amtrak headquarters mandated that the polices be used company-
    wide, and that variations in practice open the process up to the
    influences of bias[.]”), with Dukes v. Wal-Mart Stores, Inc.,
    
    222 F.R.D. 137
    , 145 (N.D. Cal. 2004) (“Plaintiffs present
    evidence that Wal-Mart’s policies governing compensation and
    promotions are similar across all stores, and build in a common
    80
    feature of excessive subjectivity which provides a conduit for
    gender bias that affects all class members in a similar
    fashion.”). As the Dukes court explained, such a “policy” of
    delegating discretion is “just the opposite of a uniform
    employment practice that would provide the commonality needed
    for a class action.” Dukes, 
    564 U.S. at 355
    . 6
    Indeed, in the wake of Dukes, courts “have generally denied
    certification when allegedly discriminatory policies are highly
    discretionary.” Tabor v. Hilti, Inc., 
    703 F.3d 1206
    , 1229 (10th
    Cir. 2013). But Dukes “did not set out a per se rule against
    class certification where subjective decisionmaking or
    discretion is alleged”; rather, “to satisfy commonality, a
    plaintiff must demonstrate that the exercise of discretion is
    6    Plaintiffs point to the testimony of one deponent to argue
    that the ultimate decision to hire or promote an employee rested
    exclusively with Amtrak’s Chief Executive Officer. See Pls.’
    Class Cert. Mem., ECF No. 303 at 16 (citing Walker Dep., ECF No.
    309-4 at 4). Declarations from other employees, however, suggest
    that individual hiring decisions are made by local managers
    based on a host of factors. See Ray Decl., ECF No. 322-5 ¶ 44
    (“the Hiring Manager, sometimes with input from his or her
    department, is responsible for selecting the final candidate for
    hire”); Allan Decl., ECF No. 321-3 ¶ 17 (explaining that the
    “ultimate decision making authority” on a hiring decision “lies
    with the Hiring Manager”). Accordingly, plaintiffs have not
    established that only upper-level management were involved in
    many or all the challenged employment decisions. See Scott v.
    Family Dollar Stores, Inc., 
    733 F.3d 105
    , 114 (4th Cir. 2013)
    (explaining that Dukes is “limited to the exercise of discretion
    by lower-level employees, as opposed to upper-level, top-
    management personnel”).
    81
    tied to a specific employment practice, and that the ‘subjective
    practice at issue affected the class in a uniform manner.’”
    Scott v. Family Dollar Stores, Inc., 
    733 F.3d 105
    , 113 (4th Cir.
    2013) (citation omitted). In other words, the requisite “glue”
    may be provided by “unit[ing] acts of discretion under a single
    policy or practice, or through a single mode of exercising
    discretion.” In re Countrywide Fin. Corp. Mortg. Lending
    Practices Litig., 
    708 F.3d 704
    , 708 (6th Cir.2013); see also
    Tabor, 703 F.3d at 1229 (to satisfy commonality, plaintiffs must
    “point to ‘a common mode of exercising discretion that pervades
    the entire company’”) (citation omitted).
    Plaintiffs suggest that they provide such “glue” because
    Amtrak’s common and uniform employment policies — as set out in
    corporate policies governing promotions and transfers and
    through various collective-bargaining provisions — unite the
    individual acts of discretion of lower-level employees. See
    Pls.’ Reply in Supp. of Mot. to Certify Class, ECF No. 344 at 6-
    14. 7 To be sure, the Dukes Court recognized that, “‘in
    7    Amtrak moves to strike certain new arguments raised by
    plaintiffs in their reply memorandum in support of their motion
    for class certification. See Def.’s Mem. in Supp. of Mot. to
    Strike Reply, ECF No. 353-1 at 4-18. Amtrak further moves to
    strike portions of the declarations submitted in support of
    plaintiffs’ opposition to Amtrak’s motion to exclude Drs.
    Bradley and Fox as inadmissible under the Federal Rules of
    Evidence. See id. at 18-31. Taking the second argument first,
    the Court agrees with Amtrak that the Court cannot rely on
    plaintiffs’ declarations without resolving Amtrak’s evidentiary
    82
    appropriate cases,’ giving discretion to lower-level supervisors
    can be the basis of Title VII liability . . . since ‘an
    employer’s undisciplined system of subjective decisionmaking
    [can have] precisely the same effects as a system pervaded by
    impermissible intentional discrimination.’” Dukes, 
    564 U.S. at 355
     (quoting Watson v. Fort Worth Bank & Trust, 
    487 U.S. 977
    ,
    990-91 (1988)). But “demonstrating the invalidity of one
    manager’s use of discretion will do nothing to demonstrate the
    invalidity of another’s,” and therefore, in the usual course, a
    party seeking class certification “will be unable to show that
    all the employees’ Title VII claims will in fact depend on
    answers to common questions.” Id. at 355-56; cf. Garcia v.
    Johanns, 
    444 F.3d 625
    , 632 (D.C. Cir. 2006) (“Establishing
    commonality for a disparate treatment class is particularly
    difficult where, as here, multiple decisionmakers with
    significant local autonomy exist.”). Thus, to establish
    commonality under such a theory, plaintiffs must show how
    Amtrak’s uniform polices resulted in a common mode of exercising
    objections. See supra Part IV. Because the Court does not rely
    on the portions of the declarations to which Amtrak objects, the
    Court does not address Amtrak’s objections at this time. As for
    Amtrak’s first argument, the Court finds that, to the extent
    plaintiffs’ raised any purportedly new arguments in their reply,
    Amtrak sufficiently addressed those arguments in its motion to
    strike. Accordingly, because Amtrak will not be prejudiced by
    the Court’s consideration of plaintiffs’ reply memorandum, it
    denies Amtrak’s motion to strike any “new” arguments.
    83
    discretion that pervaded the entire company and led to the
    discrimination about which plaintiffs complain.
    Plaintiffs try to make such a showing by pointing to (1)
    the testimony of their expert that Amtrak’s uniform employment
    policies were vulnerable to bias; (2) statistical evidence that
    shows disparities in selection and discipline rates between
    African-American and non-African-American individuals; (3)
    anecdotal evidence from members of the putative class describing
    instances of racial discrimination; and (4) the testimony of a
    former Amtrak employee discussing the inadequacies in Amtrak’s
    handling of discrimination complaints. As explained more fully
    below, the Court finds that plaintiffs have failed to put
    forward “significant proof” that any alleged disparate outcomes
    in Amtrak’s hiring, promoting, and disciplinary decisions are
    the result of a common mode of exercising discretion.
    Accordingly, plaintiffs have not satisfied Rule 23(a)’s
    commonality requirements, and plaintiffs’ proposed classes
    cannot be certified.
    1.   Dr. Finkelman’s Testimony Is Unreliable And
    Therefore Does Not Support Plaintiffs’ Theory of
    Commonality
    Plaintiffs assert that the opinions of their industrial-
    organizational psychology expert, Dr. Jay Finkelman, support
    their contention that Amtrak’s human-resources practices made
    the company’s employment decisions vulnerable to bias. Pls.’
    84
    Class Cert. Mem., ECF No. 303 at 17-18, 26. Dr. Finkelman opines
    that individual managers departed from Amtrak’s uniform hiring,
    promotion, and disciplinary policies in a way that “allowed for
    subjectivity and the potential for bias or discrimination.”
    Finkelman Dep., ECF No. 319-3 at 4-5; see also Finkelman Rep.,
    ECF No. 304-3 at 25 (“There is a disturbing and pervasive
    randomness to the evaluation, selection and discipline
    procedures that Amtrak apparently uses throughout the system.
    There are few is any controls against intentional or inadvertent
    bias or discrimination. The process appears to be highly
    subjective and unstructured.”). As previously explained,
    however, Dr. Finkelman’s failure to verify the facts supporting
    his opinions render his report and testimony unreliable under
    the standards set forth in Daubert v. Merrell Dow
    Pharmaceuticals, Inc., 
    509 U.S. 579
     (1993). See supra Part
    III.C. Therefore, the Court will not consider his report or
    testimony in evaluating plaintiffs’ commonality arguments. 8
    8    In any event, Dr. Finkelman’s report and testimony do not
    show that managers or others at Amtrak applied their discretion
    in any common way that caused racial disparities. Indeed, he
    does not opine that Amtrak’s practices actually resulted in any
    biased employment decisions; rather, he opines that Amtrak’s
    processes created a “potential” for bias. Finkelman Dep., ECF
    No. 319-3 at 4-5. As Amtrak correctly notes, this sort of
    testimony is similar to the testimony offered by the plaintiffs’
    expert in Dukes, who opined that Wal-Mart’s corporate culture
    made it “vulnerable” to bias but “could not calculate whether
    0.5 percent or 95 percent of the employment decisions . . .
    might be determined by stereotyped thinking.” Dukes, 
    564 U.S. at
    85
    2.   Plaintiffs’ Statistical Evidence Does Nothing To
    Establish That Amtrak’s Employment Practices Led
    To Any Alleged Disparate Outcomes
    Plaintiffs next point to statistical evidence to show that
    Amtrak’s facially-neutral employment policies resulted in a
    disparate racial impact. Pls.’ Class Cert. Mem., ECF No. 303 at
    18-19, 26, 30. Specifically, plaintiffs’ statistical experts,
    Dr. Bradley and Dr. Fox, found that African-American individuals
    were hired and promoted for vacant positions at rates lower than
    their non-African-American counterparts and were disciplined at
    rates higher than their non-African-American counterparts. See
    generally Bradley/Fox Rep., ECF No. 304-1.
    Statistical evidence may, of course, be used to prove
    discrimination on a disparate-impact theory. See, e.g., Watson
    v. Fort Worth Bank and Trust, 
    487 U.S. 977
    , 991-1000 (1988).
    Dukes did not change this standard, but rather reiterated that
    statistical correlation cannot substitute for a specific finding
    of class-action commonality. See Dukes, 
    564 U.S. at 356
    . In
    other words, “merely proving that the discretionary system has
    produced a racial . . . disparity is not enough” where
    plaintiffs are unable to identify a specific employment practice
    354. The Supreme Court found that this testimony could be
    “safely disregard[ed]” and was “worlds away from ‘significant
    proof’ that Wal-Mart ‘operated under a general policy of
    discrimination.’” 
    Id.
    86
    that is responsible for the alleged disparity. 
    Id.
     This is
    particularly true when, as here, the challenged employment
    practices combine both objective and subjective components. See
    Watson, 
    487 U.S. at 994
     (“Especially in cases where an employer
    combines subjective criteria with the use of more rigid
    standardized rules or tests, the plaintiff is in our view
    responsible for isolating and identifying the specific
    employment practices that are allegedly responsible for any
    observed statistical disparities.”).
    Here, the critical question is whether Dr. Bradley and Dr.
    Fox’s statistical analysis shows that subjective employment
    decisions at Amtrak led to racially disparate outcomes. Dr.
    Bradley admitted, however, that the statistical analysis did not
    focus on any particular employment practice, and he acknowledged
    that he therefore cannot opine that a particular employment
    practice caused any alleged racial disparities:
    Q. Dr. Bradley, I’d like to ask whether or not
    you can give a professional statistical
    opinion or do you give a professional
    statistical opinion in your report that a
    particular employment practice at Amtrak
    caused   adverse   impact   against   African-
    Americans?
    A. I cannot.
    Q. Did you study whether a particular
    employment practice at Amtrak caused adverse
    impact?
    A. I did not.
    87
    Bradley Dep., ECF NO. 331-3 at 27.
    Dr. Bradley reiterated this conclusion later in his
    testimony:
    Q. If we start at a global level, how do I
    know that the employees that I’m looking at .
    . . were affected by some type of criteria
    that had adverse impact on them that was the
    same criteria?
    A. Well, it may not be the same criteria. You
    get differences I think like we do across all
    of these jobs in a particular craft. And
    blacks are showing a smaller rate and it is
    statistically significant, that indicates to
    me there’s some problem somewhere and we need
    to investigate where that problem is.
    Id. at 32-33. In other words, plaintiffs’ statistical experts do
    little more than establish that African-American candidates are
    underrepresented in Amtrak’s hiring and promotion decisions, and
    overrepresented in Amtrak’s disciplinary decisions. This is
    precisely the sort of statistical evidence that was rejected as
    insufficient in Dukes. See Dukes, 
    565 U.S. 356
    -57.
    Moreover, in conducting their analysis, Dr. Bradley and Dr.
    Fox examined employment decisions across four craft groups, each
    of which contain numerous positions with different
    responsibilities, that are overseen by different supervisors,
    that are in different locations, and that are covered by
    different labor unions. See Expert Rep. of Jerrold A. Glass, ECF
    No. 320-4 ¶¶ 14-24. When asked about his approach, Dr. Bradley
    88
    conceded that his aggregated analysis would not permit any
    conclusions about the potential causes of any racially-disparate
    impact seen in the statistical analysis:
    Q. Wouldn’t you want to . . . try to find the
    jobs that are similar to each other and
    aggregate them?
    A. At some point once you you’ve got adverse
    impact, you want to try and drill down and
    find out where the problems are occurring.
    Q. Did you do that in your study, try to drill
    down?
    A. I have not done that.
    Q. Why not?
    A. I wasn’t asked to do that in this particular
    case.
    Bradley Dep., ECF No. 331-3 at 32. Other courts have rejected
    Dr. Bradley’s expert opinions for similar reasons. See Anderson
    v. Westinghouse Savannah River Co., 
    406 F.3d 248
    , 262-63 (4th
    Cir. 2005) (district court did not err in excluding Dr.
    Bradley’s opinions because his statistical analysis did not
    compare similarly-situated employees and therefore was not
    probative of whether or not there was a disparate impact).
    Indeed, Amtrak’s statistical expert — whose qualifications and
    opinions plaintiffs do not challenge — found that there was no
    consistent pattern of adverse outcomes for African-American
    individuals when decisions were analyzed based on job-specific
    89
    selection criteria. See Expert Rep. of Donald Deere (“Deere
    Rep.”), ECF No. 328-5 at 28-32.
    Nor did Dr. Bradley and Dr. Fox consider objective factors
    like seniority, previous work experience, or education in
    examining Amtrak’s hiring and promotion decisions. See Bradley
    Dep., ECF No. 331-3 at 27-29. For example, when asked whether
    his analysis took into consideration a particular individual’s
    work experience in assessing whether the selection process had
    an adverse impact, Dr. Bradly admitted that it did not.
    Accordingly, he acknowledged that it was “possible” that his
    findings of disparate impact could be explained by a wholly
    “legitimate factor” that played “a decisive role” in the
    decision-maker’s employment selection. 
    Id. at 28
    . For this
    reason, too, plaintiffs’ statistical evidence does not
    demonstrate commonality. See Garcia v. Jones, 
    444 F.3d 625
    , 635
    (D.C. Cir. 2006) (district court acted within its discretion in
    rejecting statistical analysis where the expert “failed to
    account for variables that affected the analyses” and therefore
    did not connect any alleged disparate impact to defendant’s
    policy or practice); Gonzalez v. Brady, 
    136 F.R.D. 329
    , 333
    (D.D.C. 1991) (because “plaintiffs’ statistics merely compared
    the relative number of Hispanics and non-Hispanics at the
    various grade levels” and did not “show the comparison between
    similarly situated Hispanic and non-Hispanic employees (i.e.,
    90
    employees with similar qualifications and experience),” they
    “offer[ed] little assistance in establishing the existence of
    the aggrieved class”).
    3.     Plaintiffs’ Anecdotal Evidence Shows Variability,
    Not Commonality
    Plaintiffs also offer anecdotal evidence — in the form of
    declarations from 101 putative class members — in support of
    their contention that a common mode of discretionary
    decisionmaking resulted in racial discrimination across each
    alleged subclass. Pls.’ Class Cert. Mem., ECF No. 303 at 19-22,
    31; 
    id.
     Ex. 8, ECF No. 304-8.
    To be sure, these declarations provide far too many
    examples of very serious racial discrimination. For instance:
    •    Bryant Cox states that a white manager
    called   him   a   “nigger”   on  multiple
    occasions, including in front of an Amtrak
    EEO Officer and a supervisor. Decl. of
    Bryant Cox, ECF No. 304-8 at 39, ¶ 11.
    •    Windell Greene explains that, in addition
    to being subjected to racial epithets, he
    once found “a rope noose about 6-7 inches
    in diameter hanging from a beam” in a common
    work area. Decl. of Windell Greene, ECF No.
    304-8 at 80, ¶ 27.
    •    Betty Haymer states that, when she and other
    African-American employees objected to
    being assigned maintenance work outside on
    a rainy day, the supervisor yelled at them
    and called them a “[b]unch of niggers.”
    Decl. of Betty Haymer, ECF No. 304-8 at 81,
    ¶ 17.
    91
    •    Lena Johnson recounts that, “[b]etween 1980
    and 1995, [her] white Supervisor, Bill
    Lake, would use the word ‘nigger’ on a daily
    base. For example, he would say to an
    African-American employee, ‘Nigger, get
    that machine started.’” Decl. of Lena
    Johnson, ECF No. 304-8 at 126, ¶ 6.
    •   Alfred Felton recalls that, “[i]n about
    1998, white employees hung a black doll from
    a noose in the locker room. Later, the doll
    was taken down and attached to the back of
    a golf cart. [He] also observed a white
    employee dragging a black doll behind his
    scooter. On several occasions, [he] heard
    white employees threaten to drag “Niggers”
    behind the trains when they departed.”
    Decl. of Alfred Felton, ECF No. 304-8 at
    451, ¶ 16. 9
    The use of deeply offensive racial epithets by Amtrak
    supervisors almost certainly created a hostile work environment
    for the individual employees subject to the abuse. See Ayissi–
    Etoh v. Fannie Mae, 
    712 F.3d 572
    , 577 (D.C. Cir. 2013)
    (suggesting that “the use of an unambiguously racial epithet
    such as ‘nigger’ by a supervisor” could alone be sufficient to
    establish a hostile work environment) (citation omitted).
    The declarations do not, however, offer evidence that
    Amtrak’s supervisors exercised their discretion in a uniform
    manner. For one, the declarations demonstrate that, although
    9    Although Amtrak objects to portions of Mr. Felton’s
    declaration, it does not contest the paragraphs cited by the
    Court. See Def.’s Mem. in Supp. of Mot. to Strike Decls. of Pls.
    (“Def.’s Strike Decls. Mem.”), ECF No. 330-1 at 18-20 (objecting
    to paragraphs 7, 10, and 17).
    92
    some supervisors exercised discretion in a discriminatory
    manner, others did not. See, e.g, Decl. of Garner Willis, ECF
    No. 304-8 at 297, ¶¶ 7-8 (attesting that one white manager
    “screamed at [him] . . . . using racially charged language” but
    that his white supervisor removed the manager from the crew and
    sent him to training upon learning of the behavior). Moreover,
    the declarations establish that members of plaintiffs’ putative
    subclasses experienced discrimination based on a number of
    different policies or practices. For example, plaintiffs submit
    four declarations from Amtrak employees in the engineering craft
    groups. As evidence of racial discrimination at Amtrak, one of
    those employees, Marcus Brunswick, points to the fact that he
    and another African-American applicant failed the “subjective
    visual” portion of a test required for an electrical traction
    position, whereas several white applicants took the test and
    passed. Decl. of Marcus Brunswick, ECF No. 304-8 at 282, ¶ 6. 10
    Mr. Brunswick also claims that it took him longer to be promoted
    than his white peers, who “were promoted faster because of their
    race and because they received training and mentorship from
    white supervisors.” 
    Id. ¶ 12
    . Another employee in the
    10   Although Amtrak objects to portions of Mr. Brunswick’s
    declaration, it does not contest the paragraphs cited by the
    Court. See Def.’s Strike Decls. Mem., ECF No. 330-1 at 11-12
    (objecting to paragraphs 9, 10, 20, and 23).
    93
    engineering craft group, Alfred Jones, states in his declaration
    that a supervisor retaliated against him after he complained to
    his union representative about the supervisor’s racist comments.
    Decl. of Albert Jones, ECF No. 304-8 at 290, ¶¶ 6-8. 11
    Specifically, Mr. Jones avers that his supervisor denied him
    higher pay rates, asked him to complete additional work, and
    eventually terminated him based on an insubordination charge.
    
    Id. ¶¶ 8-11
    . Although Mr. Jones was eventually reinstated after
    filing a claim for race discrimination, he continued to
    experience retaliatory conduct in the form of lower overtime
    pay, being forced to bid into lower-paying positions, and
    unfavorable job assignments that should have been given to less-
    senior white employees. 
    Id. ¶¶ 14-18
    . As the declarations of Mr.
    Brunswick and Mr. Jones demonstrate, even employees in the same
    craft groups experienced discrimination in different ways at the
    hands of different individuals. Accordingly, the declarations
    suffer from the same defects as plaintiffs’ statistical evidence
    11   Amtrak objects that Mr. Jones’ declaration, which states
    that he was terminated as a result of an insubordination
    charges, is directly contradicted by his deposition testimony in
    which he explains that he was “taken out of service” as opposed
    to terminated. See Def.’s Strike Decls. Mem., ECF No. 330-1 at
    29. The Court finds that this inconsistency does not relate to a
    material fact in the case and goes to the weight to be afforded
    Mr. Jones’ testimony. Accordingly, the Court will not strike the
    testimony at issue. See Ascom Hasler Mailing Sys. v. U.S. Postal
    Serv., 
    815 F. Supp. 2d 148
    , 163 (D.D.C. 2011).
    94
    — i.e., they do not establish that the putative class members
    are “victim[s] of one common discriminatory practice.” Dukes,
    
    564 U.S. at 345
    .
    4.   Ms. Hightower’s Testimony Is Insufficient To Tie
    Together The Claims Of Classes Spanning Sixteen
    Years
    Finally, plaintiffs argue that the testimony of Wanda
    Hightower — Amtrak’s Vice President for Diversity from 1999 to
    2001 — provides compelling evidence that supervisors received
    “signals from top management that they did not have to submit to
    investigations of discrimination and harassment or implement
    recommendations remedial action.” Pls.’ Class Cert. Mem., ECF
    No. 303 at 29. Ms. Hightower testified that her efforts to
    ensure appropriate consequences were meted out for egregious
    instances of racial discrimination were met with resistance,
    that Amtrak’s Chief Executive Officer George Warrington asked
    her to “slow the pace down” and suggested she stop making
    “aggressive recommendations” with respect to discipline, and
    that she was abruptly fired when she refused to comply with
    those suggestions. See Hightower Dep., ECF No. 309-9 at 11-15,
    18, 34-35.
    Ms. Hightower’s testimony provides forceful evidence that,
    at least for the period during which Ms. Hightower was employed
    at Amtrak, Amtrak’s leadership — and, in particular, Mr.
    Warrington — did not support Amtrak’s corporate policy
    95
    prohibiting racial discrimination. As compelling as Ms.
    Hightower’s testimony is in this regard, it nonetheless fails to
    tie together the many discretionary employment decisions to
    which the putative class members were subject over the class
    period. For one, the testimony of one former employee who worked
    at Amtrak for less than two years does not reasonably raise an
    inference that Amtrak “operated under a general policy of
    discrimination” over the entire sixteen-year class period.
    Moreover, even for the period during which Ms. Hightower was
    employed at Amtrak, Ms. Hightower’s testimony does not show that
    the disciplinary decisions of most supervisors at Amtrak were
    discriminatory. According to plaintiffs’ experts, there were
    24,136 charges for disciplinary charges over the 152-month
    period that was analyzed. See Bradley/Fox Rep., ECF No. 304-1 at
    29. Accordingly, during Ms. Hightower’s 22-month tenure,
    approximately 3,500 disciplinary charges would have been brought
    on average. Ms. Hightower testified, however, that there were
    only twenty-five cases during her time at Amtrak where she “felt
    that supervisors or managers had engaged in some kind of
    discriminatory or retaliatory activity” that “was not adequately
    addressed.” Hightower Dep., ECF No. 309-9 at 33. Thus, Ms.
    Hightower’s testimony does not provide “significant proof” that
    Amtrak operated under a general policy of discrimination. Dukes,
    
    564 U.S. at 355
    .
    96
    The cases cited by plaintiffs in which courts have
    certified employment-discrimination classes confirm the Court’s
    conclusions. Each of those cases involved more tightly-knit
    classes and concrete theories of discrimination based on common
    employment practices or the decisions of a common supervisor.
    For example, plaintiffs point to McReynolds v. Merrill Lynch,
    Pierce, Fenner & Smith, Inc., 
    672 F.3d 482
     (7th Cir. 2012), in
    which the Seventh Circuit affirmed certification of a class of
    700 financial brokers who alleged that their employer’s policies
    had a disparate impact on African-American employees. See Pls.’
    Reply in Supp. of Mot. for Class Cert., ECF No. 344 at 9.
    Although the plaintiffs in that case also accused the defendant
    of “delegate[ing] discretion over decisions that influence the
    compensation of all the company’s 15,000 brokers,” plaintiffs
    pointed to two specific employment policies that they claimed
    led to the discriminatory impact. McReynolds, 672 F.3d at 488.
    These company-wide policies provided the “glue” that held the
    plaintiffs’ claims together because they purportedly explained
    how the directors exercised their discretion in a common way
    that had a discriminatory impact. Id. at 488-89.
    Likewise, in Moore v. Napolitano, 
    926 F. Supp. 2d 8
     (D.D.C.
    2013), the court certified a class of current and former special
    agents in the United States Secret Service alleging
    discrimination in the Secret Service’s promotion practices. See
    97
    Pls.’ Suppl. Mem. in Supp. of Class Cert., ECF No. 370 at 11.
    The plaintiffs there challenged the Secret Service’s use of the
    Merit Promotion Program, which produced a numerical score for
    each candidate that was used to make promotion decisions. Moore,
    926 F. Supp. 2d at 12-13. Here, by contrast, plaintiffs have not
    identified any selection policy that applies to all putative
    class members across various job functions.
    In short, plaintiffs have not identified a specific
    employment practice applicable to all putative class members
    that purportedly caused the alleged discrimination about which
    plaintiffs complain. Moreover, plaintiffs’ evidence makes clear
    that many putative class members suffered discrimination in a
    variety of ways through the decisions of different individuals
    in a wide range of contexts. “Such potential breadth of
    experiences and claims among the putative class members is not
    the mark of a class that meets the commonality requirement of
    Rule 23(a).” Ross v. Lockheed Martin Corp., 
    267 F. Supp. 3d 174
    ,
    201 (D.D.C. 2017).
    VI.   SUMMARY JUDGMENT
    Although plaintiffs’ claims are not amenable to class
    treatment, the individual claims of the named plaintiffs
    survive. The Court therefore proceeds to consider Amtrak’s
    motion for partial summary judgment on plaintiffs’ disparate-
    impact claims.
    98
    Summary judgment is appropriate when the moving party has
    shown that there are no genuine issues of material fact and that
    the moving party is entitled to judgment as a matter of
    law. Fed. R. Civ. P. 56; Celotex Corp. v. Catrett, 
    477 U.S. 317
    ,
    322 (1986). A material fact is one that is capable of affecting
    the outcome of the litigation. Anderson v. Liberty Lobby,
    Inc., 
    477 U.S. 242
    , 248 (1986). A genuine issue exists where the
    “evidence is such that a reasonable jury could return a verdict
    for the nonmoving party.” 
    Id.
     A court considering a motion for
    summary judgment must draw all “justifiable inferences” from the
    evidence in favor of the non-movant. 
    Id. at 255
    .
    To survive a motion for summary judgment, however, the non-
    movant “must do more than simply show that there is some
    metaphysical doubt as to the material facts”; instead, the
    nonmoving party must come forward with “‘specific facts showing
    that there is a genuine issue for trial.’” Matsushita Elec.
    Indus. Co. v. Zenith Radio Corp., 
    475 U.S. 574
    , 586-87
    (1986) (quoting Fed. R. Civ. P. 56(e)). Moreover, “although
    summary judgment must be approached with special caution in
    discrimination cases, a plaintiff is not relieved of his
    obligation to support his allegations by affidavits or other
    competent evidence showing that there is a genuine issue for
    trial.” Adair v. Solis, 
    742 F. Supp. 2d 40
    , 50 (D.D.C.
    2010) (quotation marks and alterations omitted).
    99
    Employment discrimination claims under Title VII may
    proceed under both a “disparate treatment” and a “disparate
    impact” theory. See Ross v. Lockheed Martin Corp., 
    267 F. Supp. 3d 175
     (D.D.C. 2017) (citation omitted). A plaintiff alleging
    disparate impact must show that an employer uses “a particular
    employment practice that causes a disparate impact on the basis
    of race, color, religion, sex, or national origin.” Ricci v.
    DeStefano, 
    557 U.S. 557
    , 578 (2009); see also 42 U.S.C. § 2000e-
    2(k)(1)(A) (plaintiff alleging disparate impact must demonstrate
    that the employer “uses a particular employment practice that
    causes a disparate impact on the basis of race,” at which point
    the employer must show “that the challenged practice is job
    related for the position in question and consistent with
    business necessity” or adopt an “alternative practice” that has
    less disparate impact but still meets the employer’s needs).
    Although a plaintiff generally must identify a specific
    employment practice that is the subject of the challenge, if the
    plaintiff “can demonstrate to the court that the elements of
    a[n] [employer’s] decisionmaking process are not capable of
    separation for analysis, the decisionmaking process may be
    analyzed as one employment practice.” 42 U.S.C. § 2000e—
    2(k)(1)(B)(i).
    Amtrak first asserts that it should be granted summary
    judgment on plaintiffs’ disparate-impact claims because
    100
    plaintiffs have not identified any specific employment practice
    in the fourth amended complaint or motion for class
    certification that qualifies as a “particular employment
    practice.” Def.’s Mem. in Supp. of Mot. for Summ. J. (“Def.’s
    Summ. J. Mem.”), ECF No. 328-1 at 11-14. In response, plaintiffs
    state that they “challenge the selection interview process,
    ratings, rank-orderings, input from other managers, amorphous
    decision-making, and the disqualifying discipline criterion” as
    having an adverse impact on African-American employees and
    applicants. Pls.’ Opp. to Mot. for Summ. J. (“Pls.’ Summ. J.
    Opp.”), ECF No. 343 at 7. Plaintiffs claim that, aside from the
    disqualifying discipline criteria, these practices are
    components of Amtrak’s “overall selection process” and cannot be
    separated for two reasons: (1) the practices are so “interwoven”
    that no single practice is “determinative” of the disparate
    outcomes; and (2) Amtrak failed to keep adequate records to
    permit analysis of particular practices. Pls.’ Summ. J. Opp.,
    ECF No. 343 at 8.
    Amtrak asserts that both these arguments fail. First,
    Amtrak contends that the “incapable-of-separation” exception
    applies only “where common components of a uniform selection
    process exist, but it is unreasonably difficult to isolate those
    common components from each other.” Def.’s Reply in Supp. of
    Mot. for Summ. J. Reply (“Def.’s Summ. J. Reply”), ECF No. 356
    101
    at 11. Amtrak further argues that plaintiffs have not met their
    burden to show that the incapable-of-separation exception should
    apply based on the paucity of data. Amtrak points to plaintiffs’
    own arguments that Amtrak’s selection process is comprised of
    five distinct steps, which suggests that Amtrak’s selection
    process was, in fact, capable of separation. Def.’s Summ. J.
    Mem., ECF No. 328-1 at 21-22.
    Taking Amtrak’s second argument first, the Court agrees
    that plaintiffs have not sufficiently shown that the various
    components of Amtrak’s process for hiring or promoting employees
    were not capable of being divided into smaller subsets related
    to specific employment practices for purposes of a statistical
    analysis. As an initial matter, although the parties used a
    joint database to avoid an “intractable debate” over how to
    merge Amtrak’s various sources of employment data, there does
    not appear to be any serious dispute that the database alone did
    not contain sufficient information to engage in a statistical
    analysis of specific employment policies for disparate impact.
    See Pls.’ Summ. J. Opp., ECF No. 343 at 13-14; Def.’s Summ. J.
    Reply, ECF No. 356 at 16-17. 12 Even so, Amtrak maintained “job
    12   Amtrak argues that that the joint database contained
    sufficient data for plaintiffs to conduct a statistical analysis
    with respect to a “particular job in a particular location where
    the selection criteria and procedures were more likely to be
    similar.” Def.’s Summ. J. Reply. ECF No. 356 at 20-23. The fact
    that the data in the joint database could be sliced to analyze
    102
    files” that contained documents spanning the various stages of
    the employment selection process for each individual. Pls.’
    Summ. J. Opp., ECF No. 343 at 15; Deere Rep., ECF No. 331-5 at
    21. Some of these files include applicant questionnaires, pre-
    employment tests and surveys, interviewer report forms, and
    interview questions. Deere Rep., ECF No. 331-5 at 21. As such,
    the data from these job files could have been used to evaluate
    the effect of a specific practice — for example, whether the use
    of a pre-employment test or ratings forms increased the
    likelihood that an African-American individual would not be
    selected for the position.
    Plaintiffs respond that these job files could not be used
    to analyze different employment practices because the “contents
    of each file were inconsistent and varied.” Pls.’ Summ. J. Opp.,
    ECF No. 343 at 16 (providing examples of the inconsistency in
    documents contained in each file). Nonetheless, plaintiffs have
    not sufficiently shown that this information could not have
    meaningfully been used to evaluate different employment
    particular jobs by particular cities does not, however, mean
    that plaintiffs cannot proceed under the incapable-of-separation
    exception. The key question “is not whether the massive data can
    be divided up into piles,” but rather, “whether the plaintiffs
    demonstrated any resulting piles that might be formed do not
    reveal particular employment practices that are capable of
    separation for statistical analysis.” Pippen v. State, 
    854 N.W.2d 1
    , 25 (Iowa 2014).
    103
    practices. For example, plaintiffs do not offer any testimony
    from their statistical experts that the files do not contain
    adequate data to conduct a reliable analysis. Indeed,
    plaintiffs’ statistical expert acknowledged that the racial
    identity of thirty-five percent of the applicants in the
    applicant flow data was “unknown,” but argued that, from a
    methodological perspective, the missing information was not an
    insurmountable obstacle to his analysis. See Expert Rebuttal
    Rep. of Edwin L. Bradley, ECF No. 342-6 at 18. Dr. Bradley did
    not provide any similar analysis or opinion with respect to the
    purportedly missing job file data. Accordingly, the Court finds
    that plaintiffs have failed to meet their burden to show that
    Amtrak’s selection procedures are “not capable of separation for
    analysis.”
    Likewise, plaintiffs have not identified any specific
    disciplinary practices that they claim led to a disparate
    impact. Indeed, Dr. Bradley conceded that he did not attempt to
    study particular forms of discipline used at Amtrak:
    Q. So you can’t say anything based on your
    discipline study about what might have caused
    the disparate impact     in the award of
    disciplines to African-Americans?
    A. That’s correct.
    Q And you didn’t study disciplinary — any
    particular disciplinary infraction to see if
    maybe   that  type   of  infraction   had  a
    104
    discriminatory   impact   on   African-Americans,
    did you?
    A. What do you mean by that?
    Q. Well, you took all charges no matter what
    kind of charge. You didn’t look at, well, this
    charge involves absenteeism or this charge
    involves tardiness or this charge involves
    insubordination? You didn’t look at the
    different types of charges, did you?
    A. No, I did not.
    Q. You had the data to look at those different
    types of charges, didn’t you?
    A. They did show the different           types   of
    charges, that’s correct.
    Q. Why didn’t you look at the different types
    of charges?
    A. I was interested       in    the   disciplinary
    process as a whole.
    Bradley Dep., ECF No. 331-3 at 65. To survive summary judgment,
    plaintiffs are “responsible for isolating and identifying the
    specific employment practices that are allegedly responsible for
    any observed statistical disparities.” Smith v. City of Jackson,
    Miss., 
    544 U.S. 228
    , 241 (2005). This is because a “failure to
    identify the specific practice being challenged is the sort of
    omission that could result in employers being potentially liable
    for the myriad of innocent causes that may lead to statistical
    imbalances.” 
    Id.
     (citation and internal quotation marks
    omitted). Here, plaintiffs have failed to identify any specific
    practice, and therefore, their disparate-impact claims must
    105
    fail. For all of these reasons, Amtrak’s motion for summary
    judgment on plaintiffs’ disparate-impact claims is granted. 13
    VII. CONCLUSION
    For the foregoing reasons, the Court GRANTS Amtrak’s motion
    to exclude Jay Finkelman, DENIES Amtrak’s motion to exclude
    Thomas Roth, DENIES Amtrak’s motion to exclude Edwin Bradley and
    Liesl Fox, GRANTS in part Amtrak’s motion to strike portions of
    plaintiffs’ declarations, GRANTS in part and DENIES in part
    Amtrak’s motion to strike plaintiffs’ reply brief, DENIES
    plaintiffs’ motion for class certification, and GRANTS
    defendant’s partial motion for summary judgment. Plaintiffs’
    class claims are dismissed, as are plaintiffs’ disparate-impact
    13   Amtrak also moves for summary judgment on the ground that
    plaintiffs’ disparate-impact claims are not cognizable under 
    42 U.S.C. § 1981
    . See Def.’s Summ. J. Mem., ECF No. 328-1 at 10;
    see also Gen. Bldg. Contractors Ass’n v. Penn., 
    458 U.S. 375
    ,
    391 (1982) (section 1981 “can be violated only by purposeful
    discrimination”); Frazier v. Consol. Rail. Corp., 
    851 F.2d 1447
    ,
    1449 n.3 (D.C. Cir. 1988) (similar); McReynolds v. Sodexho
    Marriott Servs., Inc., 
    349 F. Supp. 2d 1
    , 7 n.3 (D.D.C. 2004)
    (“Defendant correctly argues that plaintiffs cannot bring a
    disparate impact claim under 
    42 U.S.C. § 1981
    , since purposeful
    discrimination is required under § 1981.”). Plaintiffs do not
    offer any response to this argument, and thus concede it. In any
    event, plaintiffs’ fourth amended complaint does not allege
    disparate impact with respect to plaintiffs’ section 1981
    claims. See Fourth Am. Compl., ECF No. 145 ¶ 619 (alleging that
    Amtrak’s conduct has been “intentional, deliberate, willful, and
    conducted in callous disregard of the rights of the named
    Plaintiffs”).
    106
    claims under Title VII and Section 1981. An appropriate Order
    accompanies this Memorandum Opinion.
    SO ORDERED.
    Signed:   Emmet G. Sullivan
    United States District Judge
    April 26, 2018
    107