The bullet train is moving all the time. If there are 30 stations between Beijing and Guangzhou, just stopping and accelerating again at each station will waste both energy and time.
A mere 5 min stop per station will result in a total loss of 5 min x 30 stations or 2.5 hours of train journey time!
How it works:
1. For those who are boarding the train : The passengers at a station embarks onto to a connector cabin way before the train even arrives at the station and when the train arrives, it will not stop at all. It just slows down to pick up the connector cabin. The passengers will board the train and then the cabin will be moved to the back of the train.
2. For those who are getting off: The next batch of outgoing passengers who want to alight at the next station will board the connector cabin at the rear of the train roof. When the train arrives at the next station, it will simply drop the whole connector cabin at the station.
At the same time, the train will pick up the incoming embarking passengers on another connector cabin in the front part of the train’s roof.
So the train will always drop one connector cabin at the rear of its roof and pick up a new connector cabin in the front part of the train’s roof at each station.