Lock Signal Button

Purpose

Lock Signal Button (on the left)

Locking a signal prevents a route from being set from the signal. Locking signals is done using the LsSpT button.

Operation

Manual lock light (combined signal)

Manual lock light (shunt signal)

To lock a signal, press the signal button together with LsSpT. If the signal is showing a "proceed" aspect, the signal will immediately drop to "stop". A yellow light at the foot of the signal will become lit.

Unlocking a signal is achieved in much the same way using the Unlock Switch Button (LsESpT).