A fatal train collision in mid Wales, which claimed one life and seriously injured four others, could have been prevented had the train driver utilised an emergency speed reduction system, an investigation has concluded.
The Rail Accident Investigation Branch (RAIB) found that the driver of one train admitted it had “not occurred to them” to deploy the manually operated sander.
The head-on crash, which occurred on October 21, 2024, resulted in the death of passenger David Tudor Evans, 66, who died “as a consequence of the collision”.
The incident was Britain’s first fatal crash involving multiple trains in over a quarter of a century.
The collision took place near Talerddig in Powys, on a rural stretch of the Cambrian line, which predominantly features single track with passing loops for trains travelling in opposite directions.
Despite braking, a westbound Transport for Wales (TfW) train failed to stop as intended inside a loop and rejoined the single line too soon, crashing into an oncoming train run by the same operator.
The RAIB said this happened because the westbound train’s wheels were sliding, which can be a particular issue in autumn when fallen leaves make tracks slippery.
The class 158 trains involved in the crash have two systems – one automatic and one manual – to dispense sand between wheels and rails when extra grip is needed.
The RAIB revealed in an interim report in April last year that the westbound train’s automatic system did not work in the moments before the crash because of several failures, including blocked hoses, electrical faults and incorrectly installed plates measuring the flow rate of sand.
In its full report published on Thursday, the RAIB said the driver did not deploy the emergency sanding system, which is done by pressing a yellow plunger in the cab.
The system discharged sand as expected when tested after the crash.
Investigators calculated that the train would have stopped within the loop as planned if the manual sander was used when its emergency brake was activated.
The RAIB said a rule book for TfW drivers states they should deploy the emergency sander “when a train is unable to stop in the usual distance” and its use may avoid a collision.
But the driver – who was not identified in the report – did not recall “any training” on the system and had not previously used it, according to the report.
The report noted that “they stated that it had not occurred to them to use it on the night of the accident”, which may be because they initially believed the train would slow down without further intervention.
An RAIB survey of other TfW drivers after the accident “revealed a lack of clarity” about the circumstances requiring the system to be used, investigators said.
The westbound train travelled approximately 1,080 metres (0.7 miles) beyond its intended stopping position before the collision.
It was moving at about 24mph when the crash happened, while the other train was travelling at about 6mph.
Mr Tudor Evans was a passenger on the westbound train.
Three other people on the train – including the guard – were seriously injured, while at least 18 suffered minor injuries.
Damage to the cab of the eastbound train trapped the driver, who was also seriously injured.
The other five people onboard that train reported minor injuries.
The report made nine recommendations aimed about reducing the likelihood and mitigating the consequences of a similar event, including urging TfW to review how drivers are trained.
Andrew Hall, the RAIB’s chief inspector of rail accidents, described the Talerddig crash as “a tragedy”.
He said: “Widely varying levels of grip between steel wheels and steel rails is an inherent issue for railways and a lot of effort goes into managing this and its possible consequences.
“That can involve the way track and the surrounding area is maintained, the way trains and signalling systems are designed, and the way trains are operated and maintained.
“The Talerddig investigation found factors associated with several of these areas, and related to the way different parts of the overall railway system interacted.”
He added: “I sincerely hope the lessons of this accident deliver lasting safety improvements.”
Dave Calfe, general secretary at train drivers’ union Aslef, said: “Our thoughts are with the family of David Tudor Evans, who tragically lost his life that day, and with those who were injured, including our member.
“We welcome the recommendations in the report and will assist their implementation to ensure incidents like this become even rarer on Wales’s railway.”
TfW was approached for a comment.
