Automotive-spec electrical equipment lives on a whole 'nuther level of existence than our little models - meaning tougher, heavier, weather-proof or at least resistant, monstrously amped-up by comparison. It could probably handle all your locos at once. Think of your "big" Pittman motors - now think of your car's starter motor.
Auto stores can be a moderately good source of things for us. I know an HO'er who re-motors all his locos with remote outside mirror motors from his brother's auto scrap business. Smooth and indestructible in model RRing, and I imagine would do in many O-scale applications. (Some can be coggy; he skips those auto makes. I think he finds the Honda mirror motors to be his favorites.)
