Napier v. Atlantic Coast Line Railroad

Background

Interstate railroad companies challenged state rules in Georgia and Wisconsin that required specific equipment on locomotives: Georgia prescribed an automatic firebox door and Wisconsin required cab curtains during winter. Some engines ran only inside a State and some crossed state lines. The carriers asked federal courts to block state officials from enforcing those rules against locomotives used in interstate commerce. The cases reached the Court after different lower-court outcomes: the district court in the Georgia case granted an injunction, while Wisconsin courts had denied one.

Reasoning

The central question was whether the federal Boiler Inspection Act and the rules the Interstate Commerce Commission may make under it cover the whole field of locomotive equipment so states cannot add their own requirements. The Court found that Congress gave the Commission broad authority over the design, construction, and materials of every part of locomotives and tenders, and that this authority includes the power to prescribe specific devices. Because Congress intended the Commission’s standards to govern, state laws addressing the same subject are precluded, even if they aim mainly at health or comfort rather than accidental injury. The Court therefore affirmed the district court’s injunction in the Georgia case and reversed the Wisconsin decisions.

Real world impact

The decision means federal standards set through the Boiler Inspection Act and the Commission, not individual state rules, determine what equipment interstate locomotives must carry. States cannot force different equipment on those locomotives; if more protection is wanted, parties must seek rules from the Interstate Commerce Commission, which can set varying standards by season or class of service.