Dale,
I always thought that the depot was almost identical on both sides. I guess I haven't looked at the track side of it for a long time, but I do know that there were origionally two windows instead of the one now. I'd also always thought the depot was white as I'd never seen an origional photo of it red. I guess it kind of makes sense though, why have all the stations but one the same color. The coaches were green with black roofs, and I have a picture of #26 flipped over on its side in 1927, and it is definately still green. I would expect that the rest of the cars would be green too. Usually railroads painted everything at once, so the cars were probably all changed at the same time. So I would say that from 1918, to at least 1927, the cars were green, and I would guess they were proabably painted pink about 1930, or so. I'd keep the cars green though, as they were that color through most of the decade you're modeling.
Thanks Again, Taylor