Hi Keith. Lou Kovac and Neil Young along with others were working on that project. I believe Neil has a patent on it. Lou gave the demo dogs the low down on the system. It was going to use infrared all over the layout so that if a train was getting close to another the system would slow down the rear train. They were also thinking about automatically putting a train in a siding so another could pass and then restart the engine in the siding. The sensor track most likely came from that work (sense the engine, ID it and send commands).
Train America also had a system that never got to market around the same time.
