scope:

This Network Rail standard applies to all permanent and temporary markings made to the track on Network Rail infrastructure. This includes track geometry and radius information and excludes vertical profiles.

Purpose

This document is one of two related control documents, the other being NR/L3/TRK/3242, that specify correct and accurate track marking for On Track Machines (OTM). Consistent track marking:

a) helps to avoid confusion between the operators and Network Rail (NR) Technical Staff about the work required;

b) helps to reduce or remove damage to infrastructure and prevents delays;

c) enables tamping closer to obstructions where previously whole sleepers may otherwise have been missed by the On Track Machine which leads to better quality, and more accurately tamped track; and

d) provides intangible benefits of:

  1) increased engagement of the Track Geometry Supervisor (TGS) on site;

  2) improved relationships and communication between NR and operators (external contractors) on site; and

  3) greater "buy-in" to the pre-site preparation and design process.

These benefits help control risks identified in:

e) NR/GN/TRK/8001/0203 (Loss of geometry (twist and cyclic top) beyond safety limits)

f) NR/GN/TRK/8001/0403 (Loss of geometry (horizontal alignment) beyond safety limits)