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The prime mover is the main motor in a locomotive. For example, all GO Transit engines save for the GP40s and the F40s used to have a 567-series prime mover, rated at 3000hp (horsepower), but the F59PH’s have a 710G3 prime mover. It too, is rated at 3000hp. The GP40s and F40s used a 645-series prime mover.
