It sounds like rather than disconnecting the current the wheels are shorting the track? Does it spark a lot when the back wheels are placed on the track? If so I would suggest the insulation on the wheel axle has broken down.
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It sounds like rather than disconnecting the current the wheels are shorting the track? Does it spark a lot when the back wheels are placed on the track? If so I would suggest the insulation on the wheel axle has broken down.