BobbyD posted:I'm thinking like Joe, somewhere you either have swapped wires between blocks or a car/engine bridging a gap if two individually powered loops.
That's what I was kind of thinking. I will remove the cars and engines. What is the best way to isolate which one is feeding back? I wired cut off switches on each output feeding the isolated track sections from the 2 terminal blocks being fed from the TIU channel outputs.