The ASB rule NWT 308 and procedure NPR 703 did not provide sufficient description for the task of using protecting signals for an alternative route. (Safety issue)
Network Rules changes brought in December 2020 prohibit the clearing of the absolute controlled signal immediately protecting the worksite.
Sydney Trains has introduced changes to the network rules and procedures for Absolute Signal Blocking that prohibit the clearing of the signal immediately protecting the worksite in order to run a train using an alternative route. These changes were introduced in December 2020.
The ATSB considers this safety action as adequate to manage the risk of a signal being cleared and inadvertently allowing a train into a worksite when using an alternative route.