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

What is a "Blocks 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 is an automatic block signal system?

An automatic block signal system is composed of a series of block signals. Except where a current of traffic has been established on a track and Rule 251 movement authority is in effect, permissive signals and ABS do not authorize the use of, or movement on, the main track.

What is automatic block signaling (ABS)?

Automatic block signaling ( ABS ), spelled automatic block signalling or called track circuit block ( TCB ) in the UK, is a railroad communications system that consists of a series of signals that divide a railway line into a series of sections, called blocks. The system controls the movement of trains between the blocks using automatic signals.

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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