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Challenging agency regulations in court can often prove an uphill battle. Federal courts will often review regulations deferentially under Chevron, emphasizing the importance of agency expertise and judgment. And the familiar “arbitrary-and- capricious” standard of review lacks the bite of the de novo standard that appellate courts use when reviewing pure legal questions. This paper examines a successful challenge to agency regulations in the transportation sector brought by the Association of American Railroads. The case is Association of American Railroads v. Department of Transportation, 821 F.3d 19 (D.C.
- Cir. 2016). It involved a scheme in which the Federal Railroad Administration and