This is great work done by two Moving Forward Network Participants, Diane Bailey and Melissa Lin Perrella of NRDC.
You might be surprised by some of their findings. This was an eye opener for me:
...PM and NOx emissions can be higher from locomotives relative to modern diesel trucks. For example, in the case of tier 2 locomotives, they can produce up to 6 times more NOx and almost twice the PM emissions as 2010 diesel trucks on a 25-mile route.
Source: Natural Resources Defense Council
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