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I BELIEVE THAT UNION PACIFIC WENT WITH THE 70 MACS BECAUSE THE 90 MACS WERE BOUGHT FOR THE COAL TRAIN USE. UP TRIED THE 90 MACS ON INTERMODEL TRAINS BUT DIDN'T LIKE THEM AS MUCH AS THEY LIKED THEM ON COAL TRAINS. SO THEREFORE THEY WENT TO GM AND BOUGHT 1000 70 MACS SO NOW THEY HAVE A GOOD HIGH HORSEPOWER LOCOMOTIVE FOR THEIR INTERMODEL TRAINS.
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