Box Cars vs Other Traffic

[e-paw]

I think the good doctor explained it about the best you could. I just want to add that the type of traffic mix depends on a lot of different variables like, railroad practices, location, era, season, etc. As an example back in the 80's/90's when I was living in Bayonne NJ most of the traffic was tankers for the local oil and chemical industries. Now in the same town it a good mix of all kinds of cars as NS/CSX use the yard as a holding pen for everything that is overflowing from Oak Island.