Steve,
I think I have all the freights, quite a few I never knew existed. I have 12 power units. I am trying to find the Diner, Michigan and the notorious Ontario. I have no idea why it is so hard to find as they produced equal amounts. I have yet to see the army locomotives, the Brookside Wine locomotive and the Eel River. Searching is a real challenge, but very rewarding when you find something new.
Frank