I would qualify some of that to "3-rail O gauge". Casey Jones was brought in by AHM in plastic by the thousands in the 1970s, and IMP brought in enough steeple cabs in brass that I have three! Usually had to part with around sixty bucks for one. Very close to those YV motors, but copies of South Shore . . .
I do have some Williams, notably the scale "J", and will add a die cast 773 one of these days. The brass 700 freight cars converted fairly easily, and are way better than the MTH attempt.
