scope:

This procedure applies to Network Rail maintenance staff who undertake corrective or preventative maintenance. Individual role/responsibilities for this procedure are detailed in the RACI.

Purpose

The purpose of this procedure is to define the methods of control of signal maintenance diagrams within maintenance. Such controls shall ensure that the correct issue of diagrams are maintained at the work sites, that amendments are carried out in a controlled manner, and that obsolete diagrams are removed to avoid inadvertent use.