Signal Key Switch (SKS) Blocking

A new Network Rule “Signal Key Switch Blocking” Procedure will be released in September 2019.

A new training for the use of SKS and application of the Signal Key Switch Rule & Procedure will be made available for Protection Officers Level 1-4 and Handsignaller Level 2 by end of September 2019.

Protection Officers who have previously trained in SKS will need to do the training again because of the introduction of SKS Blocking.

The current SKS’s installed over the network with further information will be released through a Safe Notice by mid-September 2019.

This Infographic video has been produced to provide an overview of Signal Key Switch Blocking.

If you have any questions please email