2000 – July – Ursich – Fit for Purpose – Signalling Solutions with Processor Based Interlockings

John Ursich Control and Communications Systems Manager, Westrail Westrail has embarked on a signalling and communications modernisation program for its key Freight Services network mainline routes. The first stage of this program recently resulted in a contract being awarded for the design, supply and installation of Processor Based Interlocking and a new train control system. This paper discusses Westrail's vision, issues and decisions leading up to the building block approach for the project and why the PBI application was considered to be the best "fit for purpose" safety case outcome in search of the final signalling system technology. The adaptability of PBI for in-cab or trackside signal technology options is discussed and how this will assist Westrail in its quest to find the ultimate choice of signalling system solution for the final stage of the modernisation program to replace signals, track circuits and related equipment.