10,000 Brilliant Ideas

I know this must have been dreamed up before. How can you ride a train and not think of ways of doing it better?. But why doesn't it exist yet? Specifically, why doesn't it exist on my commute? I could sleep in an extra 10 minutes! Basically these are stopless trains. They are made up of several short cars with automatic doors on each end that couple together automatically. There is one of these coupled units at each stop. You come to the stop hop on the short car in front of you and when the train nears the stop, the car takes off on it's own in front of the train. The train catches up to it and couples on and the doors in the back open up. You then walk back through the train to the car of the stop you're getting off on (as seen by the digital notice boards) and sit down. The train drives full speed until your stop when the doors in front close and your segment detaches and slows down to the stop. You hop off enjoying the fastest land commute known to man. Not to ment