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I suspect it was because they needed the horsepower. UP had been buying GP B-units, including GP9B's and GP30B's and running long strings of GP's on fast freights. The DD35 was essentially a GP35 A and B unit on a single frame - same number of traction motors per prime mover. The Centenials were the first single unit diesels to match the horsepower of a Big Boy so that much horsepower in a single unit wasn't new to UP. Even with that much power, Centenials often ran in pairs with a fast SD40 in between. The U50's were 'recycled' by GE from the early gas turbines.
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