From my experience the only AC open frame motored locomotives I like are F3s, GP7/9s with separate trucks/motors, FM Train Masters, and NW2s with separate trucks/motors. They are all scale sized and run well. Not as slow as modern can motored locomotives but well enough I still run them with modern stuff. I don't care for any of the other locomotives powered by AC motors. All my steam locomotives are scale pieces powered by Pittman motors.
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