A train driver who died in a crash near Bedford had passed a red signal moments before the collision, the Rail Accident Investigation Branch says.
Shaun Burton, 60, was pronounced dead at the scene after his East Midlands Railway service struck the rear of another on the same line on Friday evening.
More than 100 people received hospital treatment in the aftermath of the incident.
Fifty-three were still in hospital as of Monday, including eight people in critical care, according to the British Transport Police.
On Wednesday, the Rail Accident Investigation Branch (RAIB) said in an interim report that Mr Burton’s train proceeded past a red signal near the scene of the crash in Elstow at 5.15pm on Friday.
It added that “it is not yet possible to say what indication the driver received” from automatic warning system (AWS) equipment fitted to the train.
In a tribute issued by British Transport Police (BTP) earlier this week, Mr Burton’s family said: “We are devastated by his loss. Our thoughts are also with those affected by this incident.”
Dave Calfe, general secretary of Aslef, the train drivers’ union, said: “We are all heartbroken by the death of Shaun Burton which leaves a hole in the lives of his family, friends, and colleagues, which will never be filled.
“Shaun, a driver at East Midlands Railway, joined the railway relatively late in life.
“He loved public transport – he used to work on buses and coaches – before he became a train driver seven years ago.”
On Sunday, Network Rail called the crash a “tragic, isolated incident”, as it launched a major operation to minimise significant disruption expected on the rail lines.
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