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[quote user="GP40-2"]the Yellowstone Class was the ultimate all around heavy freight steam locomotive[/quote] The Big Boy was just a part of it, a fast pacing-one.What I found pretty cool is the fact that the SP let them even run backwards, moving their unpivoted mass through curves...even with no roller-bearings? Leading passenger trains? Never read probs about them, though... another nice engineering ex.lars
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