Leaves on the track are being investigated as a possible cause, as Network Rail spends millions clearing foliage during autumn due to its slippery effect.

Prior to the accident, Transport for Wales had advised passengers of reduced speeds on the line due to reports of extremely slippery track conditions.

Inspectors from the Rail Accident Investigation Branch (RAIB) began their investigation on the night of the incident and are expected to release an early report this week.

The Cambrian line will remain closed while investigators gather and analyze further evidence, with updates expected from the RAIB soon.

An increased police presence is expected in the area as part of the investigation and community support efforts.

A train collision occurred near Llanbrynmair in Powys, Wales, on the evening of October 21, 2024, resulting in one fatality and 15 injuries.

The police confirmed the fatality and are currently investigating the circumstances surrounding the death.

Railway engineer Gareth Dennis indicated that investigations will focus on potential causes such as low adhesion or failures in the European Train Control System (ETCS).

The deceased was a man in his 60s, whose family has been notified and is receiving support from specialist officers.

Initial investigations suggest that low adhesion between the train wheels and rails may have caused one train to slide while braking.

The incident involved a low-speed collision between the 6:31 PM service from Shrewsbury to Aberystwyth and the 7:09 PM service from Machynlleth to Shrewsbury.

British Transport Police were alerted to the collision at 7:29 PM, prompting a multi-agency response from emergency services.