NR NR/L2/SIG/11201/PROTOCOL ISSUE 1 PDF

The scope of this module oulines the overarching requirements by Network Rail for the delivery of safe signalling design.

It applies:

a) from scheme conception to acceptance into service and, where applicable, to decommissioning and disposal;

b) to both staff and suppliers of Network Rail acting either as client or design authority.

c) to Network Rail, clients and design authorities involved in the design of signalling, including development, specification, production, verification, approval, implementation and recovery.

Purpose

This module sets out Network Rail’s signalling design engineering requirements from development of concept, design through to implementation and operation of new and altered signalling systems. These requirements mean designs, including details, calculations, processes and interfaces, are sufficiently safe and aligned to client requirements.

This module contains requirements and guidance on signalling engineering applications and processes. The content supports the specific and general requirements described in Railway Group Standards and the Network Rail Signalling Principles Handbook [NR/L2/SIG/30009].

NOTE Where there is a conflict between this standard and a Railway Group Standard or the Network Rail Signalling Principles Handbook [NR/L2/SIG/30009] then this standard shall not take precedence

Decisions made by a competent person should be supported by appropriate evidence or documentation.

NOTE Use of designer notes on drawings (see HSE CDM guidance) will generally suffice as may Design Log entries.

Any adoption of alternative solutions requires an assessment commensurate with the significance of the proposed change and which follows the guidance provided by the Common Safety Method for Risk Evaluation and Assessment [CSM-RA]; Network Rail’s adopted method for the control of safety risks.