Just wanted to add
I was watching a movie called, "THE RED BARON". It came out in 2009 it's a warner Bros/German production. It's a very well done film, some artistic license they avoid the dogfights that did in Werner Voss, Major Hawker, and the Red Baron himself. I thought it was tastefully done.
Anyway
There is a scene where The Red Baron is sitting outside with some his squadron and there appears to be a "standard gauge" 3-rail model train going around on the table. I think by 1914 this was possible. Check it out. The aircraft reproductions were really well done. We enjoyed the movie..