Final Rule for Control of Emissions of Air Pollution From Locomotive Engines and Marine Compression-Ignition Engines Less Than 30 Liters per Cylinder

On this page:

• Rule Summary
• Rule History
• Additional Resources

Rule Summary

The U.S. Environmental Protection Agency (EPA) is adopting standards that will dramatically reduce emissions of diesel particulate matter (PM) and oxides of nitrogen (NO_x) from locomotives and marine diesel engines. This three-part program aims to (1) Tighten emission standards for existing locomotives and large marine diesel engines when they are remanufactured; (2) Set near-term engine-out emissions standards, referred to as Tier 3 standards, for newly-built locomotives and marine diesel engines; and (3) Set longer-term standards, referred to as Tier 4 standards, for newly-built locomotives and marine diesel engines that reflect the application of high-efficiency aftertreatment technology.

• Final Rule (pdf) (2.1 MB, published June 30, 2008)
• Regulatory Impact Analysis (pdf) (10.3 MB, EPA420-R-08-001, March 2008)
• Summary and Analysis of Comments (pdf) (1.79MB, EPA420-R-08-006, March 2008)

Rule History

• Proposed Rule and Related Materials

Additional Resources

• Fact Sheet: EPA Finalizes More Stringent Emissions Standards for Locomotives and Marine Compression-Ignition Engines (pdf) (142 KB, EPA420-F-08-004, March 2008)
• Technical Highlights: Emission Factors for Locomotives (pdf) (261 KB, EPA-420-F-09-025, April 2009)