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AN INTRODUCTION TO - page 52 / 72

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Signals: There are mainly two types of signals namely Main signals and Subsidiary signals.

I)

Main signals

Main signals are of further two types namely:

  • A)

    Stop signals

  • B)

    Permissive signals

  • A)

    Stop Signals

The most common indications shown by Stop Signals are as follows:-

a) Stop: This requires a train to stop dead and not pass the signal except under special instructions or emergency procedures. (Stop signals may be passed after halting and waiting in automatic block territory – usually 1 min. during the day & 2 min. during the night.) This indication is also known as Danger.

b) Caution: This allows a train to proceed past the signal with caution (at reduced speed), being prepared to stop at the next signal. It can mean that the next signal is at Danger, or that the track ahead has speed restrictions.

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