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No such thing as SD75MAC. There are SD75M's and SD75I's. Both rated at 4300hp. The SD60MAC is rated the same as the SD60 and SD60M, that being 3800hp. Only 4 SD60MAC's were built and paved the way for the SD70MAC (a very, very good locomotive). You will see the 75's running with the SD60's and SD60M's, however the SD60MAC's were test units and have been returned to EMD.
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