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Thank you RWM for correcting this. You are right on, I did not looked up where these mines sit now, but was not aware of  those great regional differences of quality of coal in Wyoming/Utah. I just cited those values, to have a start for Paul's calculations. Yet, we still do not know what coal was used (maybe UP's coal companies sold the better coal for customers, leaving the worse coal for their engines?). I do not think that would lead to so false conclusions at all: Paul calculated 5,5% efficiency with 10.000Btu/lb., with ~12.000Btu/lb, those mentioned 4,5 - 4,7% efficiency would be still in the ballpark, wouldn't it? Paul, have you interest to re-run your calcs with 11.500Btu/lb. and 12.500Btu/lb.?   Cheers lars
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