Some of this is too hard to follow, but you have an over head to get Center rail red wire AC power in to the board. Where do you get outer rail AC ground from? The chassis and the outer rail of the track? Correct? If so, you have a poor connection and you are seeing that arcing as the AC return to ground makes and breaks. Dirty wheels or a poor connection via the black ground wire screws. Or you do have Positive DC voltage making it to the chassis. That can be Coupler, smoke element or Motor leads for a PS-3 engine. Damage wire along chassis or heat sink, or at motor terminal/can. G
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