scope:

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

The Handbook contains principles and derogations which may only be used in the context of a Modular Signalling Scheme.

This standard can also apply to schemes where Modular Signalling is suitable but has minor additional functionality or other variations from the Modular Signalling Handbook.

Projects other than those designated Modular Signalling Schemes may not make use of these principles, derogations and variations without obtaining separate, project specific authority to do so.

Any variances from Group or Network Rail standards in connection with Modular Signalling have been sought in accordance with normal practice.

Variations from this Handbook shall be referred to Network Rail Technical Services in their capacity as "System Authority" for Modular Signalling.

This standard applies to all persons involved in the development of Modular Signalling Schemes and systems including but not limited to: operators, infrastructure owners, clients, sponsors, project/programme managers, engineers, contractors and suppliers

Purpose

The purpose of this document and its appendices is to provide information for those implementing Modular Signalling on Network Rail infrastructure.

The intended audience covers all potential users including project and programme developers, project managers, engineers, designers, third-party systems integrators and contractors.