I know this sounds wack - about as good as Dr. Hotball's suggestion - but check your local library. Back when I was a pup and beginning to get serious about trains, our library was full of books about railroads... British railroads, nearly exclusively. The one or two volumes on U.S. practice were from Eastern roads' perspective. It was frustrating, actually. Granted, those books were in the (British) Big Four era, so I can't tell you what might be there now.
Anyway, since most public libraries tend to hang on to stuff forever, you might find a starting point there.
