ATRICS screens, TVS screens and indicator diagrams have a limited capacity to display infrastructure information, especially non-signalling assets. Additionally, Sydney Trains does not believe that incorporating more information on these screens is a solution, but rather it has potential to introduce new risks.
As part of the coded ASB process, protection officers are required to provide their physical location by reference to two signalling assets; Signal number, Points Number or a platform. These were determined to be the three most reliable identifiers as they are clearly identifiable to a signaller in reference to ATRICS screens, TVS screens and indicator diagrams.
The requirement for two reference points to be used also greatly reduces the potential for confusion when a single point of reference is used i.e. on the Sydney side of signal X, or 2 Kilometres beyond signal Y. Sydney Trains believes this requirement will address this action.
The Australian Transport Safety Bureau is satisfied that the ‘coded Absolute Signal Blocking (ASB) process’, if completed and implemented, will improve the identification of infrastructure reference points required when granting ASB.