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Quoth WMohrCHS: "Also, I agree the N&W etc. (on the East coast ) engines were more powerful, but not correctly employed (I hope that word is okay) like the Big Boys had been. - " Beg to differ, sir. N&W designed its locomotives to produce their maximum drawbar horsepower at the speeds they'd spend most of their time running. The Y-5-6 series developed its maximum drawbar horsepower at 25 MPH, ideal for N&W's tonnage, grades and curves. The class A 2-6-6-4 developed its maximum drawbar horsepower between 40 and 45 MPH, exactly at the point where it could be used to greatest advantage in the services in which it was used. Big Boy developed his maximum drawbar horsepower at 41 MPH. Working westbound up Sherman Hill he never got that fast if he had his full tonnage. Working eastbound up the Wahsatch he had one short area where he'd get up that fast if he had his full tonnage. The rest of the time he was working below his maximum horsepower speed. In the "saddle" between the Sherman summit and Wahsatch summit, he could run that fast, but there were no big grades to deal with. Figured on the basis of time spent working at or above the maximum drawbar horsepower speed, the N&W engines were far better utilized than the Big Boy. Welcome to the Forum, BTW. Old Timer
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