Holding: Petitioners’ state-law design-defect and failure-to-warn claims fall within the field of locomotive equipment regulation pre-empted by the Locomotive Inspection Act, as that field was defined in Napier v. Atlantic Coast Line R. Co.
Judgment: Affirmed, 6-3, in an opinion by Justice Thomas on February 29, 2012. Justice Kagan filed a concurring opinion. Justice Sotomayor filed an opinion concurring in part and dissenting in part, which Justices Ginsburg and Breyer joined.
Merits Briefs for Petitioners
Amicus Briefs in Support of the Petitioners
Merits Briefs for the Respondents
Amicus Briefs in Support of the Respondents