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The N&W Y6b was used for heavy coal drags on steep grades in the eastern mountains. The Big Boy was used to pull long, heavy freights over moutains at high speed. Let's put it this way: <br /> <br />The N&W took a locomotive 30% lighter than the Big Boy, and somewhat smaller as well. At 25 mph, both locomotives had 5300 HP, so the N&W could do more with less. Of course, just like the Big Boy vs. Allegheny debate, the two locomotives never did the same tasks, so this will be another unsolved mystery in the wonderful world of railroading. <br /> <br />So in the end, they really aren't better than eachother because they never did the same tasks.
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