When I powered up my Challenger for the first time, it had a short and would not run at all. No sound, smoke, lights, nothing. It would just trip the breaker on my transformer. I narrowed down the short to the locomotive and opened it up. A screw had come loose from the motor mount and ended up being one of the three screws I found floating around in the box when I unboxed the engine. As for the motor, it was loose and would not sit at the correct angle. I screwed down the motor mount using one of the three screws and the engine fired up with lights, smoke, and sound. It has been running fine now for the past few days. My guess is the loose motor was touching something that was causing the short. Hope that helps.
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