|Progression in NOx and PM standards for switch locomotives (one of the regulated categories). Click to enlarge.|
The US Environmental Protection Agency (EPA) has finalized its Tier 3 and Tier 4 emissions standards for locomotives and marine diesel engines. Tier 3 emission standards will take effect in 2012, followed by Tier 4 in 2015.
The final requirements will bring earlier and greater emission reductions of NOx and PM from the locomotive and marine sectors than the proposed program envisioned. This is accomplished by finalizing the first-ever national standards for remanufactured large commercial marine diesel engines (above 600kW) and starting Tier 4 NOx requirements for line-haul locomotives and for the largest (2,000-3,700 kW) marine engines two years earlier than initially proposed. More via greencarcongress.com