I watched a film of Chicago where the trains seemed to have a wide array of diesel models mixed into each. I believe even a very wide number of road names too?
I wish I could remember what film it was, I'll go look thru my DVR list. I do remember thinking how cool it was to see all the different engines and colors.
I run all types together on my RR. I usually group by road name or what's available (running good) in the power pool. Unless the grandkids are over, then it's what they pick.
