On my previous layout I had an interchange track between a 2 rail and 3 rail section of the layout. There was an insulated track in between so engines had to stay on one side or the other. I had a about a dozen "dual use" freight cars with 2 rail trucks and couplers that I used to switch back and forth. It worked fine, and like others have said you had to change the trucks or they would have shorted out the 2 rail tracks.
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