Yes. Check the wire that is coming from the accessory slide shoe and make sure that it is not touching any part of the metal frame of the freight truck. If it is, then the AC+ coming from the hot shoe when the car is operating is directly shorting out on the frame of the freight truck, which is AC common coming from the outer rails of the track. The solution is to unsolder the wire from the accessory slide shoe, replace it with a new wire that is soft and has insulation keeping it from shorting out, and soldering it back in to the operating mechanism and to the operating slide shoe on the truck. That will stop the problem.
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