I recently bought a used set of 2002 Lionel Sante Fe F3 diesels. My question is - can I run these new engines with my 1956 ZW transformer? (It's the big one with the four pull handles.) The engine manual says "do not run these engines with DC current" and yet doesn't a transformer turn the AC current from the wall into DC current? I'm obviously a little confused here. The trains run on the old fashioned 3-rail tracks which seems to suggest an AC arrangement, but I'm not sure.