3-rail AC — O Gauge Model Train Wiring

crutschow said:

When I was a kid, I had a Marx 027 train set.
It bugged me that the train would significantly slow down on the opposite side of my (simple) layout due to track resistance.
After some thought I had the idea of making one connection from the controller to the near side, and then run a single wire to the opposite side for the other connection.
That meant the track resistance to the train was fairly equal no matter where the train was, and it then ran at essentially the same speed everywhere on the track.

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