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[quote]QUOTE: Originally posted by TARGUBRIGHT You would think Union Pacific had learned from the Big Boy failure, "Bigger is not better". I am surprised the SD90mac's are not seeing some of these problems. TIM A [/quote] Well I hate to burst your bubble Mr. Tim, but UP's Big Boy steam engines were were quite a big sucess with the UP, just as the DDA40X was also. Bigger may not be better for every RR, however, both the Big Boy and DDA40X fit UP's style of railroading very well. UP liked to run large and long heavy trains (without helpers if possible) and the DDA40X provided the horsepower and tractive effort to do that.
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