No charges were filed. But you did ask for feedback on your idea. I think the take-away is that diodes and/or bridge-rectifiers suitable for train usage have become remarkably inexpensive and readily available. Likewise, relays have become remarkably inexpensive hence practical to incorporate into layouts for whatever reasons. When I saw your 3-relay diagram I immediately thought of the 4-channel relay modules that end up less than a buck per relay (free shipping from Asia), and even has screw-terminal connectors so no soldering required!
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