This is a prewar  cast iron Wind up from American Flyer Locomotive. The wind up mech, and brake works perfectly, and it rolls smoothly. This would have had a tender that held a battery, that powered the headlight, which is why there's a wire sticking out from the back. The only flaws are the missing key, tender, and half of the cowcather is missing. Other than that, this would be perfect to used for parts, maybe even to restore, or just put up on a shelf for display.