I like Super O track too. My dad used it for a layout he built. I still have the engine he used, and the rollers still have grooves in them. It is NOT hearsay. I seem to remember the buss clips coming off a couple of times that may have contributed a little bit to making the grooves. However I was less than six years old, so I really don't recall if that happened very much. I know my dad soldered a lot of the wired connections, so I can only assume he must have also soldered the buss clips too. My dad dismantled the layout when we moved, and then we seldom used that track anymore. We had a lot more O27 track, crossings, and switches, so that's what we used for our annual temporary Christmas layouts under the tree afterwards. Connecting and disconnecting O27 track was a lot easier for me as a kid, so that's a big reason why I didn't opt to use Super O track. I never stopped liking its look, though.
For years, I'd never known anyone else who'd used it. A couple of my friends had Lionel trains, but they only had O27 track.
The diameter was, in fact, 36" for a circle of Super O track. That's why it was possible to run an HO train beneath it in the father and son set shown on the cover of the 1960 catalog.
