The Train Control System permitted the NCO to set an unviable route for the train and then displayed it as viable. The train control system alarm designed to alert the NCO to the setting of an unviable route was nullified by the absence of gauge detection.
Response to safety issue
In future, if modifications are made that alter or add to the Phoenix Train Control System display presentation, ARTC will provide both an engineering brief of the effects of this modification and operational instructions to Network Control Centre personnel.
ATSB comment/action in response
The action taken by ARTC does not address the inadequacy of the TCS system to prevent the NCO from setting a route of incorrect gauge in dual-gauge territory.