NR NR/L2/TRK/001/C01 ISSUE 4 PDF

This module of NR/L2/TRK/001 specifies requirements for the maintenance and inspection of track geometry and gauge clearance. It mandates:

a) processes and frequencies for undertaking routine maintenance and measurement of geometry;

b) details of those track geometry faults which, if identified, require immediate actions including the blocking of the line to traffic or imposition of an emergency speed restriction;

c) minimum actions to be taken upon discovery of track faults that have reached limiting values including those requiring the blocking of the line to traffic or imposition of an emergency speed restriction;

d) methods for detailed inspection of track gauge in both plain line and switches and crossings.

Additional requirements specific to the maintenance of tight clearances and track position, including monitoring and survey frequencies are contained within NR/L2/TRK/3201.

Unless otherwise stated, the specification applies to all running lines and sidings open to traffic. Particular requirements at leased depots are specified in RT/CE/S/037.

This module applies to track that is undergoing renewal, or is in a temporary condition in connection with underbridge or other works, as well as to track which is in normal maintenance.

Purpose

NR/L2/TRK/001 is a system specification that gives the minimum requirements for the inspection and maintenance of Network Rail's permanent way.

NR/L2/TRK/001 has been divided into five modules and incorporates all the extant Letters of Instruction, which are now withdrawn.

This module of NR/L2/TRK/001 is based upon the content previously appearing in clauses 10 and 11 of NR/L2/TRK/001, Issue 3, together with Letter of Instruction NR/L2/LI/105, Issue 2. It has been extensively revised.

This module contains updated requirements for the monitoring, measurement (or recording) of track geometry whether undertaken manually or by the operation of track recording vehicles. It also sets out the revised requirements for corrective actions in response to faults, and for the analysis of track geometry quality data.

Discrete geometry faults previously described as "Level 2" defects, or exceedences, are now designated as "Immediate Action" or "Intervention" Limit faults, and a further category of "Alert Limit" (based upon the former "Level 1" exceedence), has been added. This framework, and the values applied are consistent with the approaches now specified in BS EN 13848-5.