I see your door layouts and raise with this: I'm not sure it would fit on a door but those are some nice ladders.
Ah - the Valley Transit Authority yard. This is the light-rail yard for Santa Clara County VTA (i.e., street cars)
I Found a prototype Switching puzzle in Laredo, Texas Not only is there a switchback, but there is a materials unloading area at the end on the switching lead. I think that this could easily make a nice shelf layout.