Investigate train operations and route management on the Stratford to Okahukura Line, and other routes through remote areas; such investigation to include:
• the performance of the train control radio system
• the suitability of, and compliance with procedures, for tracking the progress of trains en-route
• the procedures when en-route track warrant clause 10 radio check calls are not acknowledged by train control
• the effectiveness of any existing emergency response plan
• crew arrangements and rostering
and initiate the action necessary to address any deficiencies found.