Yes, the DCS signal from the TIU goes out thru the positive (red) post to the track and the engine sends back to the TIU thru the ground (black) post. Starting with PS3 engines, they were real sensitive to that. It’s even worse I’d you use common ground loops instead of “star” wiring. I am not sure how sensitive 2 rail engines are to that, but 3 rails are sensitive. The DCS signal is a DC current riding on the AC current going to and from the engine on 3 rail engines. The “watch dog” signal is only going out thru the positive feed when power is applied.
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