A legal challenge by the Association of American Railroads (AAR) has opened a new front in the debate over rail safety regulation in the United States. The industry body has filed suit against the state of New Jersey, seeking to block recently enacted legislation that introduces stricter operational requirements for freight railways, particularly those handling hazardous materials.
The lawsuit, lodged in federal court in Trenton, argues that the state law oversteps constitutional boundaries by intruding into an area governed at federal level. The measure, signed into law by former governor Phil Murphy in January, has drawn support from labour unions and safety advocates. It is, however, strongly opposed by major freight operators.
Industry challenges scope of state intervention
At the centre of the dispute is Senate Bill 3389, which came into effect in January 2026, introducing a series of operational and safety requirements for railroads operating within the state. The provisions include mandatory two-person crews on trains carrying hazardous materials, alongside the establishment of a state-administered wayside detection programme to monitor rolling stock and infrastructure condition.
The Association of American Railroads contends that such measures represent an unconstitutional encroachment on federal jurisdiction over rail safety. In its filing, the group argues that Congress has placed regulatory authority firmly at national level, and that state-level intervention risks fragmenting standards across the network.
Legal and operational implications
The case also raises questions about property rights and operational access. Among the contested provisions is a clause permitting labour representatives to enter railroad property to carry out safety inspections, a measure the industry body claims amounts to an “unlawful taking”. The complaint names state attorney general Jennifer Davenport and transport commissioner Priya Jain as defendants.
Freight operators, including CSX and Norfolk Southern, both of which operate in New Jersey, are directly affected by the proposed rules. The plaintiffs are seeking an injunction to prevent the law from being enforced while the case is considered by the courts.
Safety debate and stakeholder positions
Supporters of the legislation, including unions such as the SMART Transportation Division, argue that the measures are necessary to strengthen oversight and reduce the risk of incidents involving hazardous cargo, which is often transported in large quantities in North America. They point to recent derailments and ongoing concerns about staffing levels and infrastructure monitoring as justification for state action.
Critics within the industry maintain that additional state-level rules could introduce inefficiencies and increase costs, while duplicating existing federal frameworks. The outcome of the case may therefore have wider implications, potentially influencing how far individual states can go in setting rail safety standards alongside federal regulation.