A train driver killed in a crash in Bedfordshire passed a red signal moments before the collision, investigators said.
Shaun Burton, 60, died when the East Midlands Railway (EMR) train he was driving hit the back of a stationary train run by the same operator.
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, near Bedford, 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.
Some 162 people were injured, 102 of whom needed hospital treatment.
Fifty-three remain in hospital, including eight in a critical condition.
Images from a forward-facing CCTV camera on Mr Burton’s train show a signal near the scene of the crash “was displaying a red aspect as the train approached and then passed it”, the RAIB said.
Preliminary analysis of a data recorder recovered from the wreckage shows it was travelling at 76mph when its brakes were applied nine seconds before the crash.
Its speed had reduced to 49mph when the impact happened.
AWS uses magnets on tracks which trigger receivers on trains.
The on-train system sounds a bell or chime when it is approaching a green signal, and a horn when coming up to a non-green signal.
In the case of the latter, drivers are required to acknowledge the warning by pressing a button.
After this happens, a visual indicator appears in the driver’s cab as a reminder.
The train’s emergency brake is applied if the warning is not responded to quickly enough.
The RAIB statement said the stationary train involved in the collision had come to a stop “unexpectedly” after a fault with its AWS equipment caused its brakes to apply.
This resulted in the signal behind it automatically changing to red, investigators said.
Approaching trains should stop at red signals.
The RAIB said its investigation will consider “the actions of those involved and any factors that may have influenced them”.
It will also look at the “positioning, visibility and conspicuity” of the signal passed by Mr Burton.
Transport Secretary Heidi Alexander said her “deepest sympathies” are with everyone affected by the “tragic collision”, particularly Mr Burton’s family and those who remain in hospital.
She went on: “The report makes clear there is still much to establish, and the full investigation will provide the answers and recommendations everyone affected deserves.
“Our railway is one of the safest in the world, and while incidents like this are incredibly rare, when they do occur we will leave no stone unturned to understand what happened.”
No timeline has been given for when the investigation will be concluded.
Last week’s publication of the RAIB’s final report into a fatal train crash in mid-Wales came more than a year-and-a-half after the incident.
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