NR NR/GN/SIG/50013 ISSUE 2 PDF

This Guidance Note sets out how to demonstrate compatibility with interlocking systems installed on the a.c. and d.c. electrified railway on Network Rail managed infrastructure.

It applies to:

a) Route Relay Interlocking (RRI) systems installed on a.c. and d.c. electrified Network Rail controlled infrastructure;

NOTE 1: This only includes relay room installations. External line circuits, TDM systems and vital Reed FDM systems which might form part of the interface between the RRI and trackside equipment are covered by NR/GN/SIG/50014, NR/SP/SIG/50015 and NR/SP/TEL/50016.

b) Solid State Interlocking (SSI) systems installed on a.c. and d.c. electrified Network Rail controlled infrastructure.

NOTE 2: This includes control centre equipment and Trackside Functional Modules (TFMs) which are manufactured by Siemens and ALSTOM in accordance with Network Rail specifications. Data Links (TDLs) and Long Line Links (LLL) which are used to send SSI data are covered by another NR/SP/TEL/50016.

It does not apply to other CBI systems.

NOTE 3: In the context of this document, solid state interlocking refers to the system developed by the British Railways Research Division in the 1970s and completed under a tripartite agreement between BR, GEC General Signal Ltd and Westinghouse Signal Ltd. This document does not cover other types of computer based interlockings.

Refer to Appendix A for a description of the equipment.

Purpose

By describing how interference from electric tractions systems can enter RRI and SSI interlocking systems and providing a methodology for demonstration of compatibility, this Guidance Note aids safe and reliable rolling stock introduction.