This Backer & Rueb tramway locomotive is based on the Dutch prototype from the North-Holland company TNHT, at the beginning of the 20th century. The model is not made for any specific drive, but as a 0m display model. The wheel chassis is easy to put on or take off, so you can still motorise it if you wish. Suggested distance of the axles is about 33 mm.
More background info on the model and prototype you'll find at www.tramworks.nl