The industry body responsible for looking into rail accidents has decided not to launch its own investigation into the recent train fire at Caerphilly station.
The Rail Accident Investigation Board had requested further information from Arriva Trains Wales following the fire earlier this month.
A RAIB spokesman said: “Based on current evidence, we have decided to leave investigation to Arriva Trains Wales who have a legal duty to investigate it themselves. We have asked for the industry investigation report to review once complete.”
However, the RAIB could still launch an investigation should new evidence come to light.
Firefighters were called on Tuesday, October 4, at around 5.26pm to the station with reports of a fire underneath a train.
Crews from Caerphilly, Whitchurch, Pontypridd and Cardiff, responded and the fire was fully extinguished and the train safely cooled by 8.50pm.
All passengers were evacuated and there were no injuries reported.
The fire is thought to have been electrical and there are claims from witnesses that smoke was seen coming from the Bargoed-bound train when it was at Queen Street station in Cardiff.
There are also claims from passengers on board that the carriage started to fill with smoke while it was at Queen Street.