A German train driver failed to notice that several cars on a regional train he was steering from Berlin to Poland got decoupled at a small local stop outside the German capital and proceeded onward, leaving behind some 80 passengers. The rear part of the train separated from the front at Alt Rosenthal station east of Berlin on Thursday without the driver noticing, the regional rail operator confirmed on Friday. “When driving off from a stop, a coupling came loose,” a spokesman for regional operator NEB explained. The train driver only noticed the breakdown at the next stop. He then drove the …