scope:

INTRODUCTION

This Code of Practice applies, in support of GC/RT5021, to all technologies of ontrack equipment used for the operation and proving of:

a) facing and trailing points (combining to form crossovers, tandem points, single and double slips, etc.);

b) swing nose crossings;

c) switch diamond crossings (effectively two point ends);

d) trap points and catch points;

e) train operated points (including spring points);

f) hand points;

g) derailers; and

h) scotch blocks.

Where it entirely addresses the situation under consideration, the use of this module is an alternative to an approved risk-based assessment. However, where the particular application or intended environment for the system introduces additional risks, these should be subject to separate assessment.

The Design Principles in Section 2 give the minimum requirements that need to be addressed, even when a risk-based approach is used. These principles are mandated in NR/L2/SIG/11201.

The following guidelines should satisfy the principles encompassed within the standard:

a) guidelines on rail clamp point locks (clamp locks) in NR/GN/SIG/11774;

b) guidelines on the use of track circuits in point layouts in NR/L2/SIG/11752;

c) the standard drawings for point layouts, fittings and detectors listed in NR/LS/CAT003;

d) supplementary mechanical information on points and fittings in NR/L2/SIG/11201, Module B14;

e) the typical circuits for point operation and detection listed in NR/GN/SIG/CAT005, which are described in NR/L2/SIG/11201, Module B15; and

f) guidelines for SSI installations in NR/L2/SIG/11201, Module B16.