I realize this is a basic question but that's where I need to start. For an older 2 rail steam loco with tender, what is the wiring scheme? A drawing would be great but an explanation will work.
I believe the tender can send power from one side/rail, and that is often routed to the loco through the drawbar. That connection goes to one of the 2 brushes. For a setup that does not have a second wire to the loco via a plug, what does the wire from the other brush connect to? To the frame?