The railking scale SW1's and Sw1500 are nice full scale models. I would do either of them in 2 rail in a heartbeat. Especially the SW1, which has horizontal drive. The Railking SW8, SW9, SW1200 are not to scale. the hoods are too long. JSYK
I agree that the Railking Scale models are very nice models for the price but I have never seen any MTH locomotive with a horizontal drive system. I believe Lionel did a S2 switcher that had a horizontal drive system and maybe that is what you're thinking of. I checked the MTH website and I looked up a SW1 and in the description it says "(2) Precision Flywheel Equipped Motors". A horizontal drive would only have 1 motor.