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[quote]QUOTE: Originally posted by broncoman Bear with me for a minute the question will come back to the topic...sort of: Are Railroads required in any states to do opacity checks? If so, since EMD picked 16-710 to make Tier 2 compliant is it an inharently cleaner motor? If question 1 is yes have opacity (or NOx tests for that matter) tests been done on 12-645s and 20-645s, 710s shown them to be dirtier based on firing order or timing. I am curious if there is a big difference or not. Have seen some diesels in the same family have huge differences in emissions as such. Dave [/quote] Yes but it depends on the location. Down in L.A. they do smog checks on locos all of the time. Up in Roseville we didn't do it very often
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