absolute block system meaning

[Civil engineering]
A block system in which only a single railroad train is permitted within a block section during a given period of time.

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at this time, the absolute block system was not being used for the jijie-gejiu line
This was called the " absolute block system ".
Even with an absolute block system, multiple trains may enter a block with authorization.
The absolute block system was in place, but was not being operated in accordance with the regulations.
The electric telegraph provided the ability for signalmen to communicate with each other and provided the basis for the absolute block system.