steamer_ctn, on 02 January 2020 - 10:48 PM, said:
I've always read that is so, here's a couple of references...for what they are worth, still looking for a more technical paper that I read...cannot find the link. That particular formula is often quoted with the factor of 308, 315 and 375 --- and yes it is also a constant to convert UoM.--- my understanding is that it has eff. built into it...I'll need to find that paper. But as you explain it...taking the eff. into account would be pointless if the RailHp was specified. --- I rely upon both Derek Morton and Bob Boudoin for their educated eff. guesses...since my experience is considerably less than theirs.
http://cs.trains.com...1/t/164703.aspx and http://cs.trains.com...11/t/75858.aspx