If adopted the Clean Air Locomotive and Marine Diesel Rule would cut particulate emissions from these sources by 90% and nox by 80% once fully phased in. The rule would tighten emission standards for existing locomotives when they are remanufactured. The locomotive remanufacturing proposal would take effect as soon as certified systems are available, as early as 2008, but no later than 2010. The rule also explores a remanufacturing programme for existing large marine diesel engines similar to the existing programme for locomotives. Other provisions seek to reduce unnecessary locomotive idling. The EPA website carries more information, and the consultation documents, on clean diesel locomotives and clean diesel marine engines.

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