NR NR/L2/SIG/14201 ISSUE 2 PDF

This Level 2 document applies to anyone given the responsibility by Network Rail for conducting overrun risk assessments of railway signals forming part of track layouts and fixed block signalling systems on Network Rail Controlled Infrastructure. They may be either Network Rail employees or appointed contractors/consultants acting on behalf of Network Rail. The appointment shall be made in writing and held on file.

It will be used for the assessment of safety risk: -

• During the design of new/altered layouts and fixed block signalling systems on Network Rail Controlled Infrastructure.

• Arising as a result of the operation of layouts and signalling.

Purpose

This Level 2 document sets out the process and tools that Network Rail shall use to comply with the Railway Group Standard GI/RT7006, Prevention and Mitigation of Overruns – Risk Assessment, and its associated Guidance Note GI/GN7606. Specifically this document mandates: -

• The structured approach to signal overrun, i.e. "Signal Passed at Danger" (SPAD) risk assessment on Network Rail Controlled Infrastructure.

• The appropriate strategies, tools, and techniques to be applied under the variety of operational and developmental situations that lead to a requirement for a signal overrun risk assessment to be undertaken.

• A clear approach to SPAD risk assessment, which shall be standardised throughout Network Rail.