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Some additional infos about that 3985-APL run in '91: Hope not repeating something, but in fact the run was, with the one notable exception at Archer Hill, a downhill run.The average speed of that train was in the upper forties. Just look at the elevation at Cheyenne and North Platte. I think the constant loss over that distance is -0.25%. I believe Tim has the most detailed plans about the track condition. Another fact, does not have those multi-linked double-stack trains some general advantage in rolling resistance? If not, why there were built like that... OK, some others, too, train length, less dead weight, etc. Consider also that the engine was totally overhauled at that time, burning oil and others advantages... I think all that helped to do the trick, regardless it produced 4700 or 5000  DBHP. Delta is less than 10%, that a fine estimation in my eyes. Let a train like that running through sags,   we might have even accelerated to nearly 70mph, for a short time. A Challenger would not be good to pull constantly 7000 tons at a grade of 0.7%. The grade of 0.82%, was the most commonly used grade between Wahsatch and Cheyenne. A Chally was rated 4290tons, 1948- era friction wheels, considering an av. speed of 15-20mph. There were 3 GE-Dash's, I think that is correct, that pulled the train into Cheyenne, than Chally took over it. The Train it took back to Cheyenne, now running constly. 0.25% up, was much smaller, 1000tons, or so.<a href="http://www.youtube.com/watch?v=GyZD7fJ12WI&feature=related" mce_href="http://www.youtube.com/watch?v=GyZD7fJ12WI&feature=related">http://www.youtube.com/watch?v=GyZD7fJ12WI&feature=related</a> If anybody would like to have a sequence of the tape for more infos, post me, I digitized it. What I want to say, seen from a overall performance, it is pretty that of an AC4400. If you really want a mess, look at this...<a href="http://www.youtube.com/watch?v=aoGBL0XFjQ8" mce_href="http://www.youtube.com/watch?v=aoGBL0XFjQ8">http://www.youtube.com/watch?v=aoGBL0XFjQ8</a> Cheers lars
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