Management of Rail Traffic with Unreliable Track Circuit Activation (Code of Practice)


Type of product being suggested:
Code of Practice
Title of product being suggested:
Management of rail traffic with unreliable track circuit activation
Date of suggestion:
23/02/2017
Reason for suggestion:
Minimise potential risk of rail traffic collision between detectable rail traffic and non-detectable rail traffic.
Sponsored by RISSB Standing Committee:
OPSC
Scope:
  • Safeworking operation of non-detectable rail traffic
  • Supporting content of national rules
  • Implementation of technology as an alternative to detectability
  • Degraded operations
Hazard identification:
1
 5.5.1.29 Signalling detection of insulated rolling stock leading to the inability to maintain timetables.
2
5.9.1.9 High tyre to tyre electrical resistance causing loss of signal detection so that trains are not detected (Signal failure)
3
5.9.1.16 Axleloads are too low causing high wheel to rail electrical resistance resulting in the loss of signal detection so that trains are not detected (Signal failure)
4
5.16.1.10 Hidden failure where detection effectiveness is not verified (Failure with interface to wayside systems – Hardware faulty – Onboard systems – System faulty)
5
9.7.1.12 Incorrect sequence of operation due to dissimilar equipment characteristics for train detection devices

Benefits:

Safety risk
Potential risk of rail traffic collision between detectable rail traffic and non-detectable rail traffic.
Risk of level/pedestrian crossing collision due to rail traffic not activating level/pedestrian crossing track circuits.
Interoperability / harmonisation
Common terminology and language minimising misunderstanding between organisations and different networks.
Commonality of operating principles for non-detectable rail traffic across networks.
Financial
Reduction in safety risk, number of incidents and resulting line suspension.
Operational efficiency