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AN INTRODUCTION TO - page 25 / 72

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Advantages of Automatic Block Systems:

  • 1.

    Due to automatic signaling, human error is eliminated which leads to greater safety and efficiency.

  • 2.

    Less number of personnel for operating signals is required which reduces the operating cost

3. The system is a “fail safe system” i.e. in case of any failure of signals due to current, are made to bring the signals the signals at Danger position.

Track Circuit - Block Unoccupied

This diagram shows how the track circuit is applied to a section or block of track. A low voltage from a battery is applied to one of the running rails in the block and returned via the other. A relay at the entrance to the section detects the voltage and energizes to connect a separate supply to the green lamp of the signal.

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