How you handle the reverse issue depends on how much you plan to use the locomotive. If you plan to use it a lot, I'd put an e-unit or even a TMCC or DCS conversion in it. If you don't plan to run it all the time, or if your layout is small, a bridge rectifier and DPDT toggle switch will be perfectly adequate. That's what I did with a tinplate Merkur locomotive I picked up a couple of years ago. It was wired for straight DC. Knowing it wasn't going to be the mainstay of my layout, I installed a bridge rectifier and hid a DPDT toggle in the cab. Works fine.
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