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It depends on the model. The old AHM Big Boys could operate on 18R track because the rear engine pivoted. I'm not sure about the newer models but I would guess they need much wider radius curvers. As for look correct even 26R is a little tight, if you want the engine to look right you would need something in the 40+ radius. This is not to say you can't run them on the tighter curvers and have fun, remember it's your railroad!
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