Ø It is a Subsidiary
signal for controlling shunt movements.
Ø It may be placed
either on a separate post or below a stop signal.
Ø It may be provided below
any stop signal except FSS.
Ø When a shunt signal
is taken ‘OFF’ it authorizes the LP to draw ahead with caution for shunting
even when a stop signal if any is at ‘ON’.
When
a shunt signal is placed below a stop signal it shall show no light in the ‘ON’
position