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.