Say a train is going from Hamburg to Stuttgart, and is passing through Göttingen. To get to Stuttgart the soonest, a stop through Göttingen would not be the best choice. But there are Hamburgers that need to get to Göttingen.
On my train are two sections. Those on their way to Stuttgart get in section A, and the Göttingen-bound get in section B in the rear. Somewhere before its destination, section B breaks away from section A. It puts on the brakes and rolls into town. The rest of the train keeps on going without need to stop, and everybody’s happy.
Anything wrong with this idea? Does anything like this actually happen?