You don’t need to isolate or block your outside rails. When you run trains. The wheels themselves will bridge them together. If you are using a form of paired wiring. Consider using relays. You then can keep your wire runs of heavy gauge wire carrying volts and track signal shorter. They can be mounted near the center of the layout. Just make up a bank of them similar to a terminal strip. The automotive Bosch style can be easily mounted. Run your paired wires to the track. You will need a small 12v power supply. Use your toggles to turn the relays on and off with much smaller wires than needed to run your trains.
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