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Nonroad Engines, Equipment, and Vehicles


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In March 2008, EPA finalized a three part program that will dramatically reduce emissions from diesel locomotives of all types -- line-haul, switch, and passenger rail. The rule will cut PM emissions from these engines by as much as 90 percent and NOx emissions by as much as 80 percent when fully implemented. The standards are based on the application of high-efficiency catalytic aftertreatment technology for freshly manufactured engines built in 2015 and later.

EPA standards also apply for existing locomotives when they are remanufactured. Requirements are also in place to reduce idling for new and remanufactured locomotives.

This page provides general and technical information on the locomotive rulemakings that affect railroads, locomotive manufacturers, and remanufacturers.

General Information

Regulations and Guidance

See the Electronic Code of Federal Regulations (e-CFR) for the full text of current regulations that apply to locomotives:

40 CFR part 1033 Emission Standards and Certification Requirements
40 CFR part 1065 Exhaust Emission Test Procedures – See 40 CFR 1033.501 for instructions on applying these test procedures to locomotives.
40 CFR part 1068 General Compliance Provisions – See 40 CFR 1033.601 for instructions on applying these compliance provisions to locomotives.

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