NR NR/L2/SIG/11201/MOD A5-3 ISSUE 1 PDF

The requirements of this module apply to both Network Rail and its design authorities for all new or redrawn signalling system control tables (electromechanical, electrical and electronic).

This module mandates the use of appropriate control table presentation for the signalling system technology being designed or amended and provides some examples of control tables for a typical layout (both route setting and lever frame). This module includes a number of appendices providing detailed guidance on the presentation of different types of control equipment.

NOTE 1 : The examples provided to illustrate the use of the control tables are to highlight the presentation and this module is not intended to prescribe the signalling controls that shall be applied within a particular interlocking system. Other modules provide general design presentation requirements and, for example, it is not intended that this module prescribes the form of title block to be provided on each sheet, just the information contained in it. Title block format is set out in Module A2-5.

This module provides only limited details on the control table presentation requirements for non-route setting systems and for lever frame mechanical locking tables (of which there are different varieties in use reflecting former regional practice and applicable to particular types of locking frames). However this module does include the interface to ground frames and their electrical controls.

NOTE 2 : Where this standard refers to SSI, it applies equally to WESTLOCK and SMARTLOCK. There are no specific control tables for the Ansaldo ACC system or VHLC system and existing formats shall continue to be used.

Purpose

Control tables (or their equivalent) define the manner in which the system of a specific site is to be arranged and show how Network Rail’s generic signalling principles are applied to a particular layout. A control table is a formal tabulation of the signal, point and other controls associated with a signalling system, showing the interlocking and other dependencies between those controls, and used for purposes such as:

• Technical approval and compliance to standards;

• Deriving information for signallers, such as signaller's route cards/list;

• Enabling production of engineering details, such as circuit diagrams and data;

• Supporting testing, such as incident testing, functional and control table testing.

NOTE : Control tables shall always be read in conjunction with the scheme plan (or signalling plan for record purposes) and any level crossing ground plan.

Control tables form an intermediate step between the concept design (defined by documents such as the scheme plan and the various requirements specifications that stipulate expected project outcomes) and the engineering details (the detailed design required to physically implement the work). The manner in which the high level requirements are realised is technology specific so the control table presentation needs to reflect the technology of the interlocking system.

This module sets out the mandatory requirements that shall apply when producing signalling control tables to make sure that safety information is presented in a form which can be read and understood without ambiguity.