This is a scarce original Antique 1920s Bing of Germany locomotive, its the wind-up style for power , it has the key and works perfectly, used with Bing railroad sets made for the North American market at the time.

In nice Condition overall, there is 1 flaw , the bar that holds the right side rear wheel has come off so the wheel can pop off. (Shown in pictures) The wheel and bar are present they just need to be reattached. This does not effect its motion however as the wind-up mechanism drives the front 2 wheels which both work perfectly.