NR NR/L2/SIG/30097/APPI ISSUE 3 PDF

This document applies to any resignalling scheme that has been designated a "Modular Signalling scheme" by the Professional Head, Signals and Controls and the Head of Operations Development. Such schemes will make use of Modular Signalling principles, technology and processes which are fundamentally different from those used for a conventional resignalling scheme undertaken by Network Rail.

Purpose

This guidance document describes in more detail the processes that need to occur during the Preliminary Scheme Design stage, as described in the main section of the Modular Signalling Handbook. It sets out the documentation and activities that have to be carried out or produced in order to create the Preliminary Design for deployment of the Modular Signalling system on a route. Although the document contains guidance the process described is approved best practice.

The number of documents that need to be produced during GRIP Stage 4 has been reduced compared to the number needed for a conventional resignalling scheme because of the simple and repeated nature of the system and of the routes for which it is suitable for application on.

Other documents within the Modular Signalling Handbook set out the technical standards, constraints, components and applications which form the Modular Signalling system and should be referred to when carrying out Preliminary Scheme Design.

This stage of the project lifecycle requires input from the Supplier who will be implementing the works, to produce certain design details from which more accurate costs can be calculated and to enable long lead work items to commence.

The project is tendered at the end of GRIP Stage 3 – the Requirements Analysis stage, to obtain: