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[quote]QUOTE: Originally posted by mac 4884 Although UP's 4-8-8-4's didn't have the pulling power of an Allengy, their tractive effort was greater, allowing them to pull 2.5mile trains up grades as steep as 2.1%. Kyoshi [/quote] The Alley had horsepower. And the ability to get up and run. The Big Boy was designed for long lonely runs of rail in the middle of no where with constant grades for tens of miles. No engine is capable of stamina over hundreds of miles with the trains that were assigned to the Big Boys. The alley could probably do the same job but sadly I have no understanding of which engine would come off first in a western setting. However, if you brought the big boy east to Saluda or Sand Patch I think the sharper curves and greater vertical changes would prevent this engine from performing as designed.
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