Railways Subsidiary Signals | Shunt signal | Calling-on signal

Basic Concepts of Railway Signalling Railways Subsidiary Signals | Shunt signal | Calling-on signal Types of Signals

Subsidiary Signals

Signals are used for reception of trains in to a station and despatch of trains out of station. Signals used for movement of trains with in the station section at restricted speed and for special purpose are called Subsidiary signals.

In MACL signalling Shunt signals and Calling–on signals come under subsidiary signals

Shunt signal :

                                   ‘ON‟ POSITION                                      OFF’ POSITION

Shunt signal                           Aspect                           Stop                                                  proceed slow-

                     Indication                  Stop dead                              proceed with caution for shunting

It is of position light type, The lights shall be white in colour. Shunt signals control shunting movements.

A shunt signal may be placed on a post by itself or below a stop signal other than the first stop signal of a station.

When a shunt signal is taken „OFF‟, it authorizes the driver to draw ahead with caution for shunting purposes although stop signal, if any, above it is at „ON‟.

When a shunt signal is placed below a stop signal, it shall show no light in the „ON‟ position.

Calling-on signal

Calling-on signal

A Calling-on signal has no independent location and displays no aspect in „ON‟ position. A calling-on signal where provided, shall be fixed below a stop signal governing the approach of a train with „C‟ marker board fixed to the signal post. A calling-on signal when taken „OFF‟ it displays a miniature yellow light.
Under approved special instructions, a calling-on signal may be provided below any other stop signal except the last stop signal.
When placed below a stop signal, it shall show no light in the „ON‟ position. A calling-on signal under main signal above it cannot display “OFF” aspect at same time.

Railways Subsidiary Signals | Shunt signal | Calling-on signal

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