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7. Automatic Blocking System
  
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Automatic block signaling (ABS) safeguards the train operations between stations and an effective means of increasing the line capacity. In the color light area, where the trains are worked on the ABS,  each running rail is divided into a series of blocks sections (track between the stations) and station sections (track between entry and exit signal). Each section is track circuited separately. Entry into each block section is governed by the automatic block signals at the entry point of the section. (Signals 1, 2 and 3 in the coming pages).  The train leaving station block A and entering station block B will be controlled by the controlled signals at respective stations. The color light area has dual tracks and under normal operation the up trains will be using up line and the down trains will be using the down line.

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Up ] 7.1 Route Establishment ] 7.2 Train on Line ] 7.3 Release of Route ]
1. Introduction ] 2. Track Circuit ] 3. Relays ] 4. Signals ] 5. Moter Points ] 6. Gate barriers ] [ 7. Automatic Blocking System ]

R. Jayanthan
Last updated on 01 January, 2002