What is the difference between automatic block and semi-automatic block?

If manual operation is not required, it is called automatic blocking; If you need to screen the program manually, it is called automatic screening.

1. Semi-automatic blocking: This blocking requires manual blocking. The train will leave according to the display of the exit signal, but the exit signal will automatically turn off after the train leaves, so it is called semi-automatic block.

2. Automatic block: according to the train operation and block division, the signal can be automatically changed, and the train runs according to the signal display. This blocking method is completely automatic, so it is called automatic blocking. Automatic block is a kind of equipment that automatically blocks trains.

Because the signals passing through the colored lights during train operation are automatically controlled by the train without manual operation, it is called automatic block. At present, the automatic block used in China's railways mainly includes single-line bidirectional automatic block (with signal lights on both sides of the line) and double-line unidirectional automatic block (with signal lights on only one side of each line). When semi-automatic block is adopted, the proof of the occupied section of the train is displayed by the exit signal (the signal passing through the line). The outbound signal cannot be opened at will, and is controlled by semi-automatic blocking machine. Only when the interval is empty can the outbound signal be turned on after the formalities are completed. It should also be noted that the outbound signal should not only ensure the safety of the train section, but also ensure the safety of the outbound train in the station. Therefore, it should be controlled not only by the block machine, but also by the station interlocking equipment.

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