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Stations will have signals which allows trains to depart from a station when it is desired to do so. To signal a train to despatech from a station signals are located at the exit point of each line on which trains wait at stations. Signals S7 and S9 in figure 4 shows such signals. These signals are referred to as Starter signals and allows trains to depart from the tracks behind them. The tracks from which the starter signals allow departure are referred to normally as berthing tracks. Quite ogten a signal ahead of the starter signals are placed ahead of all the converging tracks as S11 in figure S11. This signal is referred to as Advance starter signal and allows better management of trains within the stations.

In bigger stations facilities for adding or stabling of coaches or wagons are provided. These are by the provision of short lenght of lines connected to one of the berthing tracks and these are known as sidings. In other instances there may be need of  attaching coach or locomotive of a train on one berthing track and add to a train on another berthing track.

The availability of advance starter signal is for facilitating such movements. For such movements a seperate type of signal is used refered to as shunt signals. A typical arrangement of shunt signals for movement form siding is shown in Fig 5.

Signal S101 and S102 are shunt signals allowing shunt movements from and to the siding as shown