To prescribe the rules for reporting and responding to unsafe conditions affecting or potentially affecting the Network.
Conditions that can or do affect the safety of operations in the Network must be reported promptly to the Signaller responsible for the affected portions of track.
The Signaller must record the report on an NRF 004 Condition Affecting the Network (CAN) form.
- prevent rail traffic from approaching the affected portions of track, and
- protect affected portions of track in accordance with NTR 400 Protecting rail traffic.
- Use the ALL STOP Digital Train Radio System (DTRS) function, or
- contact the Driver or Track Vehicle Operator by any other means available.
- promptly tell other affected Network Controllers and Signallers about the CAN,
- confirm blocking facilities are applied,
- advise affected nominated Operators’ Representatives ,
- If necessary, arrange for the 1500V supply to be isolated in accordance with NGE 228 Unplanned removal of the 1500V supply.
- to warn Drivers and Track Vehicle Operators of rail traffic of the CAN,
- for Maintenance Representatives or relevant Qualified Worker to investigate.
Warning rail traffic
The Signaller must use a CAN form to give written warning to Drivers and Track Vehicle operators if:
- CAN block working is introduced, or
- faulty or potentially faulty level crossings have been reported, or
- level crossing warning equipment has been deactivated, or
- rail traffic must be restrained where blocking facilities cannot be applied, or
- it is specified in another Network Rule.
If possible, the Signaller must arrange for a Qualified Worker to give the CAN form to Drivers and Track Vehicle Operators before rail traffic enters the affected portion of track.
If it is not possible for a Qualified Worker to give the CAN form to Drivers or Track Vehicle Operators, the Signaller must dictate the CAN warning details to the Driver or Track Vehicle Operator.
The Signaller may give spoken warnings to Drivers and Track Vehicle Operators about other CANs. The Signaller must record details of the spoken warning on a NRF 004 Condition Affecting the Network (CAN) form.
Drivers and Track Vehicle Operators must acknowledge and comply with warnings.
The Signaller must continue to warn Drivers and Track Vehicle Operators until:
- the CAN no longer exists, or
- Drivers and Track Vehicle Operators are warned by other means.
Drivers and Track Vehicle Operators must use either a CAN form or other method to record in permanent form:
- details of CAN warnings, and
- CAN reference numbers.
Returning to normal operation
Returning to normal operation is authorised by the Network Controller.
If Maintenance Representatives have been asked to investigate a CAN, they must certify the line as safe for rail traffic before the Network Controller may authorise a return to normal operation.
Ending the restraint of rail traffic
To end the restraint of rail traffic, the Signaller must tell affected Drivers and Track Vehicle Operators that:
- the condition for the restraint no longer exists, and
- the rail traffic can be moved.