Not exactly RRing but some great scenes that might help someone modeling a certain period of time…
http://www.cnn.com/2014/06/24/travel/12-forgotten-hand-colored/index.html?hpt=hp_t2
Interesting photos, I wish the captions had given more where when info on the locations.
Cool pics.
I think I’ve posted this link before. Here are some color slides by Charles Cushman of NYC in the 1940s. Not really train stuff, but lots of good ideas for color and weathering. Apparently ochre was a popular trim color back then.
ETA: Note all the fire escapes.
Steve S