What is a "Block Signals"? The Most Authoritative Explanation.

What is a "Block Signals"? The Most Authoritative Explanation.

What is a signalling block system?

Signalling block systems enable the safe and efficient operation of railways by preventing collisions between trains. The basic principle is that a track is broken up into a series of sections or "blocks". Only one train may occupy a block at a time, and the blocks are sized to allow a train to stop within them.

What does it mean if a program blocks a signal?

Blocking a signal means telling the operating system to hold it and deliver it later. Generally, a program does not block signals indefinitely—it might as well ignore them by setting their actions to SIG_IGN. But it is useful to block signals briefly, to prevent them from interrupting sensitive operations. For instance:

What is automatic block signaling?

Automatic block signaling uses a series of automated signals, normally lights or flags, that change their display, or aspect, based on the movement of trains past a sensor. This is by far the most common type of block system As of 2018, used in almost every type of railway from rapid transit systems to railway mainlines.

How useful is a distant signal in an automatic block system?

The distant signal proved just as useful for the automatic block system as for manual block. It became common practice with lower-quadrant semaphores to place the home signal for the immediate block and the distant signal for the next block on the same mast. An automatic block signal system is composed of a series of block signals.

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