As for your other questions regarding color schemes, I would refer you to other past posts in this forum.
Boxcar color schemes:
As for engine schemes, I have only seen from pictures (many black and white) that their steam engines were painted black. Sometimes, #14 and #18 (their two current ones) had orange handrails and trim. If you look at postcards from the railroad (always some on ebay, and now I realise that there are TONS of them!) you can see that in the seventies they were not painted orange.
In the early seventies-late sixties, the coaches were not orange but were in fact a yellow color.
If you are really interetsed in the railroad, I would suggest you locate a copy of Edward Lewis' book "Arcade and Attica Railroad." It was last published as a second edition in 1973, but copies can still be found on ebay and at train shows. I purchased one on ebay for $45, and then that next weekend went to my local train show where a dealer was selling it as part of a package for $20 total. Thus, I now have two copies. One is my backup. The point is in NY, you can find them if you try hard enough. The book is excellent, and as far as I know, the only book on the railroad.
Benjamin L. Maggi
A&A Railroad Forum Moderator