After the post on the Siemens first electric locomotive a reader sent the images of the model above. It's the drive axle and integral motor from a more modern Siemens locomotive. The model is nicely done, desktop-size with wheels about 3-4 inches in diameter.
I described the first locomotive as geared but it appears it's more likely that it was like this design, direct drive.
The owner of the model has decided it's time to part with it, if he could only find it in his storage! Email me if interested, he'll find it.