I'm sure others will chime in, but since I appear to be the first, I'll add this link:
http://www.tcawestern.org/mccoy.htm
McCoy items can be highly desirable among tinplate collectors. I have my own collection of McCoy circus cars, and I inherited a number of pieces from my late Grandfather's collection. I enjoy them a lot. They can be very good runners, if maintained properly.
An 'Achilles' heel' of many vintage McCoy items are, unfortunately, in their zinc castings they used in wheels, motor frames, and trim, as these tend to warp and crumble badly.
Some replacement parts are available, but are tricky to find. Search the boards here if you need parts. I've bought parts off of folks from this forum, plus have made my own replacement parts using 3D printing, and common machine tools.
They can be easily run with traditional Lionel transformers and trackage or equivalent and they can be nicely paired with the more early Lionel standard gauge engines and cars.
McCoy ended production in the early 90's, if I believe right.
