Jim 1939 That was my feeling/knowledge also. But by reply to rattler21 got from the seller
" Because of the wide rails and type of metal the track is made of, it causes more wear on the rollers. We have noticed this on the trains we have bought that we have run on gar graves track over the years. "
I wish he emailed me because I would say that with your definition that would be all track. as it isn't any wider than any O gauge track I know of other than Super O.
Type of metal ??? I believe they all use the same type of metal don't they ( ie O-27 )
I know Fastrack isn't the same and think MTH realtracks but under his definition that would make me to think all O-27/O gauge track would do this.