King Charles has sent his "heartfelt thoughts and prayers" to those gathered for the 25th anniversary of the Selbry rail crash.
Four railway workers and six passengers died when an InterCity passenger service and a fully laden coal train collided at a closing speed of more than 140mph, near the village of Great Heck, in North Yorkshire, on February 28, 2001.
Relatives of those who died were joined at Selby Abbey by members of the emergency services and rail workers for a service during which candles were lit for each of the 10 victims.
The event held on Saturday saw former British Transport Police superintendent Tony Thompson, who attended the scene in 2001, read out a letter sent to him by the King's private secretary.
The King's private secretary sent a letter to those at the service
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He said: "His Majesty, whose heartfelt thoughts and prayers are with the families, friends and all those affected, has asked me to send his warmest good wishes to all those who will be gathered for this significant day of remembrance."
The crash was caused when a Land Rover, driven by Gary Hart, veered off the nearby M62 after he had little sleep the night before.
A passenger service journeying from Newcastle to London derailed as it struck his vehicle and then was hit by a Freightliner train carrying 1,600 tons of coal coming the other way.
The accident claimed the lives of John Weddle, the driver of the passenger train, Steve Dunn, the Freightliner driver, and eight other men: Steve Baldwin, Alan Ensor, Raymond Robson, Paul Taylor, Clive Vidgen, Barry Needham, Robert Shakespeare and Christopher Terry.
The crash claimed the lives of 10 people
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Charles attended a service at York Minster in 2001 commemorating the victims.
Mr Thompson described the service as "emotional" at times, attended by approximately 200 people, including the first ambulance officer who arrived at the crash scene.
Of the importance of the event, he added: "I think obviously any death is important, but when you're part of a national disaster, I think it's really important that you can gather together as a group and remember together and share what has gone on."
Hart could not move his vehicle off the tracks and was calling the emergency services when the crash happened.
The passenger service struck a freight train after Hart's vehicle veered off course
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He denied falling asleep at the wheel, but a jury found him guilty of 10 charges of causing death by dangerous driving.
He was sentenced to five years in jail, serving around half that time.
The news follows His Majesty paying a visit to Northwood headquarters in north-west London, as the monarch was given a first-hand look at a top round-the-clock military facility.
During his time at the site, the King encountered staff members who had recently participated in significant international deployments.
Charles attended a service at York Minster in 2001 commemorating the victims
| GETTYAir Marshal Suraya Marshall, Deputy Commander at Cyber and Specialist Operations Command, described the royal visit as meaning "a great deal to everyone".
She described the King's presence as "a tremendous honour" for those working at the headquarters.
Charles spoke with team members who had been instrumental in coordinating the UK's Carrier Strike Group mission to the Indo-Pacific region.
He also met personnel providing crucial assistance to Ukraine, now entering its fifth year of conflict with Russia.
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