This is a tank engine, and will fit on standard wooden or plastic tracks. I think I printed this at 50% size to get it to fit, I drilled out the wheels and used #6 screws and hot glue to finish the wheels. The model could probably be modified to add details and make sure it fits properly. This is my first design using OpenSCAD.I think I printed this at 50% to get it to fit on wooden tracks. Also used #6 screws for the axles instead of the printed ones, and hot glue to put it together.