This discussion started as a question about a Pullmor motor and half way through a question about a Williams loco with can motors was injected into the discussion. This may not end well. Regardles, there is a universal AC/DC answer. The capacitors must be non polarized and each cap goes from one brush then to a solid ground. Check your ground point for continuity with the wheels. Any motor with a commutator makes electrical commutation noise and caps are just as important on AC as on DC motors and vice versa. If you use the sheet metal chassis frame as a ground connect ground straps from it to both trucks. J
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