scope:

This document applies to all projects deemed to be Modular Signalling schemes and being implemented on Network Rail infrastructure.

The Modular Signalling Handbook contains principles and derogations which may only be used in the context of a Modular Signalling scheme and use in any other context or project type is not supported by this handbook.

Purpose

Guidance on implementing Modular Signalling is contained in the Modular Signalling Handbook, and associated suite of Appendices. The purpose of this document is to describe the system components, demonstrated as viable through trials, that support accepted Modular Signalling architectures.

This document is primarily aimed at supporting the role of the Designated Project Engineer for a Modular Signalling scheme by providing a description of the system components which may be provided by suppliers to fulfil the requirements of the Modular concept. This document provides a brief description of derogations that have been requested to support certain Modular systems but full details are contained in Appendix F.

This document covers the Technical Detail that might otherwise be presented in an Initial and Outline Project Specification and replaces the need to carry out a Technical Option Definition and Feasibility study as only the components detailed in this document are acceptable for a Modular Signalling Scheme.

This document provides technical descriptions that can be used to support technical activities during GRIP Stages 1 to 4 - Requirements Analysis and Preliminary Scheme Design stages. Site specific information for a particular scheme is detailed in the Scheme Plan and Signalling Equipment Plan.

This document is subject to revision as the status of Modular Signalling products and system acceptance changes. Users of this document must ensure that they always consult the most recent version.