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The drivetrain on their all-wheel-drive locos is pretty good in my experience - not sure which loco you have, but the usual setup is for the motor driveshaft to have a universal joint at both ends, which in turn connects to the trucks (there may be another UJ in there, depending on the loco). If the wheels are turning when you turn the power on then the drivetrain is ok. On an old loco that hasn't run for a while I'd try cleaning the grease out of the trucks (warm soapy water, rinse, dry, reassemble and regrease), add a drop of light oil to the motor bearings and the bearings on the worm gears on each truck, reassemble the loco then try running it. Old grease sometimes hardens and the tip about adding oil to the bearings will make it smoother and quieter particularly at low speeds. <br /> <br />What type of loco is this by the way? For some reason I'm thinking of a Bachmann Plus F7 here.
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