Three people have been pronounced dead at the scene of the train derailment in Stonehaven, Aberdeenshire.
British Transport Police confirmed the news, adding that six people have also been taken to hospital.
In a statement the BTP said: "British Transport Police were called to the line in Stonehaven, Aberdeenshire at 09.43am this morning (12 August) following a report that a train travelling from Aberdeen to Glasgow Queen Street had derailed.
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"Officers remain on scene this afternoon alongside the ambulance service, fire brigade and colleagues from Police Scotland.
"Very sadly despite the best efforts of paramedics, we can confirm that three people have been pronounced dead at the scene.
"While formal identification is yet to take place, the driver of the train is very sadly believed to have died. His family have been informed and are being supported by specially trained family liaison officers.
"Officers are continuing to work to inform the families of the other two people who sadly died.
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"Six people have been taken to hospital to be treated for injuries, which thankfully are not believed to be serious."
Chief Superintendent Eddie Wylie said: "This is a tragic incident and first and foremost our thoughts are with the families and friends of those who have very sadly died this morning.
"We remain on scene alongside our emergency service colleagues, and a major incident operation has been underway. I would like to reassure the public that this was not a busy service, and from CCTV enquiries and witness statements we believe all passengers have been accounted for. However, once the area has been made safe then a full and thorough search will be conducted, which is likely to take some time.
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"I know many people will understandably have questions, and we will be working closely alongside the Rail Accident Investigation Branch and the Office of Rail and Road to establish the full circumstances of how the train came to derail."
First Minister of Scotland, Nicola Sturgeon tweeted earlier today saying: "This is an extremely serious incident. I've had an initial report from Network Rail and the emergency services and am being kept updated. All my thoughts are with those involved."
