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A slug is a locomotive without a engine, it gets its power from the locomotive that it is coupled to, the large wires you saw. The purpose is to give the powered locomtive more slow speed power, if the diesel engine is run to full power with only 4 traction motors the locomotive will have wheel slip or be to fast for hump service, running less than full power waste fuel and will under be powered for hump service, the slug allows the locomotive to put full power across 8 traction motors at low speed and pull a long string of cars across the yard. gwl http://photosbygreg.20m.com
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