John, Good luck with the 930, those old Treks can be quite a bargain. I think your description of single track is close to correct. A trail that only allows a single bike to travel through is a singletrack. I would not describe it as one direction since other bikes may travel in the opposite direction, but someone has to give, or pull off the 'track' or path to let the other cyclist by. As for what Trek meant when they put the term on their bikes, beats me.