scope:

This instruction applies to all staff engaged in the maintenance and testing of all lineside assets (such as Signal Post Telephones, Crossing Telephones etc) and operational building telephones.

For the purposes of this instruction an operational building shall include: -  

  • Operational Control Offices  

  • Electrical Control Offices  

  • Signalling/Operating Centres (including Signal Boxes, Gate Boxes, Crossing Keepers Huts, token huts, GF huts and shunters cabins etc)  

  • Equipment Rooms (such as relay rooms, REBs etc)  

  • Electrical installations (such as Track Section Cabins, Feeder Stations, PSPs etc)

It excludes: -

  • Non-operational rooms situated in operational buildings (such as messrooms, offices etc),  

  • PETS units in Signalling/Operating Centres as defined above (this is covered under maintenance standard NR/L3/TEL/30181/013)  

  • Lineside plug points and telephones connected to Tunnel Emergency Communication Systems (this is covered under maintenance standard NR/L2/TEL/30097)  

  • GSM/GSM-R Crossing Phones (covered under standard NR/L3/TEL/30181/006)  

  • GSM-R HMI's (covered under NR/L3/TEL/30181/012)  

  • Concentrator HMI's

Purpose

This telecoms maintenance instruction defines the maintenance and functional testing that Network Rail requires for telephones used lineside and in operational buildings, which are provided to facilitate safety critical communications for the safe operation of the railway.

The purpose of maintaining and testing these telephones is to decrease the incidence of failures through deterioration and to identify potential failures before they become service affecting.

NOTE: It is the intention of Network Rail that, where practicable, deficiencies of a minor nature should be rectified during inspection.