scope:

This specification applies to all Network Rail managed infrastructure and to all signal assets reading onto Network Rail managed infrastructure. 

It applies:

• to all new signal assets and alterations that impact the signal sighting of a signal asset;

• when assessing signal sighting following Category 'A' Signal Passed at Danger (SPAD);

• to signal assets that require an assessment of signal sighting by mutual consent of the affected stakeholders.

It applies to Infrastructure managers, Operations Managers, Station operators and individuals introducing changes that impact signalling assets.

Purpose 

This specification details the requirements to be applied when assessing signal sighting of proposed or applied signalling assets to be read and understood by train drivers and staff influencing train movements. 

This specification gives clarity on, and additions to the requirements set out in RIS0737-CCS for undertaking signal sighting assessments. 

This specification supports the signal sighting committee when undertaking signal sighting assessments. The record of assessment enables management of the risks associated with train operations controlled by new and existing signal assets.