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I have read about the fuel consumption but I think that argument wasn't as strong as the problems keeping the 20 cyl. primemover going. In time the machines became very good and I think you would have a hard time telling the old Wisconson Central or MRL that the SD45 was not very sucessful. The MRL just love them I have read. Also keep in mind that railroads were changing from "fast freight" operations to slower speed unit trains where the extra horse power would not be needed (remember horse power is used for speed and tractive effort used for starting and pull). I have head the argument that the SD40 had the same tractive effort as the SD45 so it must be better. Well the SD38 had the same also but you don't hear that used to tar and feather the SD45 because it would take for ever to get anywhere. I believe it was more of the way railroads were changing than a bad unit that stoped the purchasing of the SD45.
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