An investigation into a near miss between a freight train and track workers in Hornby has found that inadequate supervision and inexperience led to a serious safety breach on the Main South Line.

On the morning of 7 March 2024, Fulton Hogan Limited was carrying out construction work within the rail corridor near the intersections of Halswell Junction Road and Parker Street in Christchurch. Track access was being managed under a compulsory-stop protection system, overseen by a trainee Rail Protection Officer (RPO) and a supervising RPO.

Under the arrangement, the trainee RPO had authorised two trains to pass through the worksite while ensuring workers were clear of the track. However, after the first train passed, the trainee mistakenly instructed workers to re-enter the track area before the second train had cleared the zone.

At approximately 9.00am, level-crossing alarms at both intersections activated, warning of an approaching train. The track workers immediately moved to a designated safe area. No one was injured.

An official review found that the trainee RPO, who had limited experience and was working unsupervised at the time, became distracted and failed to follow the proper procedures. The supervising RPO, who should have been present, was absent and had not received any specific training on how to coach or mentor staff undertaking safety-critical roles.

Investigators said the situation revealed serious gaps in both on-site supervision and the preparation of staff responsible for ensuring rail safety.

The incident has been formally closed, but safety experts say the lessons should resonate beyond the rail industry.

The Transport Accident Investigation Commission said the event underscored the importance of proper oversight and training, particularly when inexperienced personnel are performing critical safety tasks.

“This incident highlights the need for clear supervision protocols and training for mentors overseeing safety-sensitive operations,” the report said.