You guys: I've modeled HO but gave my last stuff away because I couldn't see it anymore. My interest is in detail modeling. I have just started setting up an O scale (or as close to scale as I can reasonably do) NYC subway. I am starting with MTH 3 rail cars with the intention of taking the center rail (+ power) and moving that to a third rail. Then via insulating connectors use one of the running rails as an actual signal rail. Complete with automatic signals.