Quote:
Originally Posted by Jeff Higgins
In the same vein, most folks would be surprised to learn that there are absolutely no emissions standards for locomotives. My God do these things ever belch pollutants. Granted, their emissions per ton-mile are a fraction that of over the road trucks, but it is rather surprising that they are completely unregulated.
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New railroad locomotives are subject to Tier 4 standards.
"Currently, Tier 4 diesel engine standards are the strictest EPA emissions requirement for off-highway diesel engines. This requirement regulates the amount of particulate matter (PM), or black soot, and nitrogen oxides (NOx) that can be emitted from an off-highway diesel engine.
Based on an engine’s horsepower rating, Tier 4 requirements were phased in starting in 2008. By the time final Tier 4 regulations were fully implemented in 2015, PM and NOx emissions had been reduced 99% compared to 1996 levels."