The difference of three blocking modes

These three traffic blocking methods are different.

The first automatic block method: the train operation of automatic block method is completed by the display of signals by each train, and the train is completed by the conversion of track circuits and signals.

The second semi-automatic block: two adjacent stations identify each other and send electricity. Only after the block procedure is completed can the train run by opening the exit signal.

The third type of telephone block: the train must be ordered by the traffic controller to stop the normal block mode, and start with the road ticket (the certificate of the train entering the section) filled in by the starting station.