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I have three Challengers by Rivarossi. The problem may not be a short at all. The engine may be loo=sing electrical pickup. I had the very same problem. The front set of drivers transfers current through the shaft through the pinion gear that contacts the worm gear on the motor. If there is too much lubrication in this area, the loco will stop when entering a curve. Also, the motor may not be exactly centered within its little cavity. Make sure the metal contacts the mate with the brush holders on your motor are properly seated. The rear drivers have a wire connected to them at the bottom. Both sets of drivers pivot on this loco. Insure that the wire is not broken. Good luck... Dave
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