WOW! I'm impressed. The only thing I know about the railroads comes from my old microfiche days. We used to process data for Evans Transportation, who managed the leasing of railroad cars, and the reports we converted to microfiche was a listing of the cars, who was leasing them, and the location of the car. Pretty big enterprise, from what I could see.
Mark - I'm going to have to talk to you about building my Weimer Grist Mill HO model one of these days.