Here's a suggestion for wiring the bridge track. The idea comes from Eric Siegel (who you are familiar with). He has a hinged Atlas truss bridge on his layout. He attached hinges to the bridge so it basically works as a bascule bridge. He had a really great wiring idea to power the bridge. He soldered the wires to the hinges. One hinge is the hot lead from the center rail of the track, and the other is the ground. The two hinges are obviously isolated.
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