As a teenage boy that just discovered girls and slot car racing approximately the same time about 30 years ago, I remember racing at a hobby shop that had a commercially made track strictly for HO. I think it was 6 or 8 lanes. Was there ever such a track produced strictly for commercial applications? Do these ever become available for sale? I now have grandchildren and over aged middle aged crazies that would like to race HO and do not have room for a 1/24 track.
Was this what is referred to, I think, as a tub track where the layout was formed from plastic or fibreglass and then Aurora or Tyco track was fitted into the layout? Check tracks for sale over on Old Weird Herald website, its mostly commercial 1/24 stuff, but occasionally there are HO tracks.
There was a commercial grade H.O. scale that was manufactured by Puma. It used woven steel braid instead of solid rails to carry the electricity. It was featured in the H.O. Slot Car Journal #3.
As far as I know, only a couple of these tracks ever made it to the U.S. Gary Beedle (BSRT fame) had one in the Seattle area.
There was also the Aurora "Tub track" and the Engleman commercial track. Pictures of both can be seen at:
In addition to the the builders that have already been mentioned there are tracks by Brad Bowman, Ed Bianchi and Wizzard. There are a few more builders that do HO tracks as well. The continuous rail tracks by Dale Buck are no longer being built, but one comes up for sale every now and again. There are two types of aftermarket tracks, continuous and sectional. With a continuous track you are more or less stuck with one layout, with a sectional track you can change the layout easily. Ed Bianchi tracks are braided, most other makers use rail. One other thing about continuous tracks is that they are a real bummer to move around. I could have gotten a BuckTrack at less than half of the original price, but I couldn't get it down in the basement. I have a MaxTrax myself and I just converted it from a road course to an oval.
Here is my MaxTrax in both its roadcourse and oval configurations. MaxTrax is the widest HO track, there is more space between the slots and the shoulders are very wide. You can't get as much track on the same table as you can with standard track, but very wide cars like Lifelike and Tyco Nascars won't be bumping each other. The track is nearly as smooth as continuous rail tracks and the electrical connections have never given me any trouble in the twelve years that I have owned it. The latest version of MaxTrax uses L shaped rails in a T shaped slot, the rails will never pull up no matter how strong the car's magnets are. I have raced on at least a dozen MaxTrax, they have all been first class. I have run on several Wizzard tracks as well, the lane spacing is somewhat wider than standard plastic track I believe. One of the track was about the first one that Wizzard sold and it did have problems with the rails wanting to pull up with magnet cars, that was fixed with later tracks.