2.2 AUTOMATIC BLOCK SYSTEM:
This system is mostly used in places where traffic density is high as in Mumbai Suburban Section.
In this particular system the signals are actuated by the trains themselves and therefore the train can follow each other between the two stations the section between the two stations is divided in to number of blocks and electric current is conveyed through the electric circuited track.
When a train enters a particular track the electric current puts the signal at danger position(red aspect) for the particular block until the train has gone nearly two blocks ahead that is for adequate distance. This system is used where traffic density is high as in Mumbai Suburban Section.
Characteristics Of Automatic Block Systems:
1. The movement of trains is controlled by stop signals which are operated automatically by the passage of trains past the signals.
2. No automatic signals assume “OFF” unless the line is clear, not only up to the stop signal ahead but also an adequate distance beyond it.
3. The line is track-circuited throughout its length and divided into a series of automatic signaling sections or blocks, each of which is governed by an automatic stop signal.