So I just ran into some info on aar.org that some of you might already know about, but here it is anyway.
This is a document with statistics on originating tons and terminating tons by product for the state I’m going to model.
http://www.aar.org/PubCommon/Documents/AboutTheIndustry/RRState_NJ.pdf?states=RRState_NJ.pdf
Hope it’s helpful!