scope:

This document shall apply to any resignalling scheme that has been designated a 'Modular Signalling scheme' by the Professional Head [S&T] Engineering 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 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 shall be carried out or produced in order to create the Preliminary Design for deployment of the Modular Signalling system on a route. [MSPI 2.II]

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 must 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:

• a price for the Supplier delivered works in this Preliminary Design stage, and

• a price for the GRIP 5 to 8 works (which may be subject to slight revision at the end of this stage)

At the end of this period of development the scope, price and programme for the proposed works will be confirmed.

The products required from the stage to achieve this are as follows, split between those produced by Network Rail and those produced by the supplier: Liaison between Network Rail and the Supplier will be required during this period to ensure compatibility between designs.