The LOCOMOTIVES Act would amend the Clean Air Act to prevent individual states from setting their own emission standards for existing locomotives and railroad engines used in interstate commerce. Currently, states like California can establish stricter environmental rules than federal standards, but this bill would eliminate that authority specifically for locomotives engaged in commercial railroad transportation. The legislation affects railroad operators and manufacturers by creating uniform national emission rules instead of a patchwork of state-by-state requirements. The bill contains no specific funding provisions or implementation timelines, as it primarily removes regulatory authority rather than establishing new programs. The measure was introduced in May 2025 and referred to the Senate Environment and Public Works Committee.
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