Then the train stops? This is intended to reduce the time to stop at small stations. There is ample time as people are loading onto the slip coach to discover

Then the train stops? This is intended to reduce the time to stop at small stations. There is ample time as people are loading onto the slip coach to discover that the train needs to stop, although I think in practice this would never happen (the train operators would never be surprised by a large number of people trying to get off all at once).