Does this shorting happen with one engine or all engines? Happen in either direction through the pair? Might roller diameter be bigger so it falls shorts between the center rail and an outside rail as it crosses over? Turn out the lights and slowly run or push the engine over the switches and observe if there is a spark. Maybe have to bypass lockons and directly connect to track so can observe shorting if it is occurring. May need to insulate with tape. On my layout I had to place tape in strategic spots on KLine O72 switch rails as some engine wheels and rollers would short the track.
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