Earlier this week I came across an interesting German HO tram layout known as Gummersbach Strabenbahn. The original layout was a rectangle, but later videos show two additions on either side of a central control panel. In the videos it runs two rail (which seems to be accepted in Germany judging by Kleine Straßenbahn ganz groß videos but not so much in North America).   Later videos  show the addition of line poles and some overhead.   There is a central three track square or platz whi