I also modified an MTH IRT set to run on prototypical outside third rail. It is easy, and you don't even have to remove the rollers. I placed a sliding contact arm under the body of a second unpowered car, connecting it to the first by a cable. Am fooling with various assemblies, and thinking of offering it as a kit. The lights draw a lot of amps. It is somewhat limited in radius, but the two-car consist runs well and in a tunnel section on a test layout where I have regular inside third rail. With this set-up you can have prototype third rail in a station, and use regular track where it cannot be seen. No need to alter the motors. I did this because if I ruined the car I didn't want it to be the power car, but a less expensive trailer. I eventually added a second contact arm to the same car to cover gaps in the third rail. With a six car set, and only one car with outside pick-up, with interior lights, the amps are two high for the small pickups, which heat up..
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