Here we go , no relays , no insulated sections. The bridge becomes the power supply for the tracks in either direction. power from the transformer goes to the bridge tracks (hidden at the hinged end underneath) Each track in both directions would have a plug that you would have to manually hook up each time you lowered the bridge . The existing feeders would have to be removed. Pain the butt to hook up?? Yes but it might just save a engine from hitting the floor..
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