scope:

The standard applies to all signalling plans, scheme plans, location area plans, bonding plans, level crossing ground plans, operating notices, standards and instructions for use within the Railway Group. It incorporates the relevant symbols from British Standard BS 376: Part 1: 2012. It applies for symbols, whether drawn manually or generated by computed aided design (CAD) systems,

This standard does not apply to Signalling control and display systems, which are covered by Module A5-5.

It does not apply to electrification plans, with the exception of bonding plans that include information from both electrification and signal engineering disciplines. Symbols for a.c. section diagrams are shown in NR/L2/ELP/27500. Symbols for conductor rail plans are given on d.c. electrical track equipment drawing RT/ETE/5/2/1; and for negative bonding plans on drawing RT/ETE/5/3/1.

The standard does not apply to symbols for permanent way plans, which are shown in NR/L2/TRK/2049. The symbols that identify Signalling requirements to be shown on permanent way plans are given in NR/L2/SP/11752.

The standard does not specify what information shall be shown in any particular type of Signalling design document, which is defined Module A3-3, A4-2, A4-3

Purpose

This module defines the symbols for plans and sketches used in Signalling applications, so that the correct information is always conveyed without ambiguity.