PRT people say dozens of vehicles can go around dozens of rails under computer control. If this is the case, why aren't there been many, many cases of single vehicle, single rail projects are being computer controlled? After all, computer controlling a train going back and forth on a single track should be EASY. That would save money, right?

Not even this is being done, but somehow the PRT True Believers tell us the much more complicated case is the next step. Shouldn't they be able to point to successful computer controlled trains all over the place if they are that great?