Thanks for sharing all the freight cars. I enjoy looking at them and the litho work is beautiful.
One thing I've often thought about is that I bet the factory employees couldn't even keep straight what they were making at times. The numbering system was probably designed by some super smart, organized, OCD person, and it was just a miserable mess of confusion for everyone else, especially with the steam locos / tenders. Think of how much productivity time was lost, just trying to put out "catalog correct" products.