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 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. The Fleischmann steam locomotive 'Anna' is a good fit for this model, according to my customers.
Version without wheels for you to motorise. Please find the working (but unmotorised) H0e 16.5 mm drive for display purposes here
More background info on the model and prototype you'll find at www.tramfabriek.nl