The East Coast mainline has been hit with severe after a train struck a vehicle on a level crossing in Cambridgeshire.
A man in his 40s was rushed to hospital by air ambulance with serious head injuries following the incident.
The Abellio Greater Anglia train smashed into the car at Nairns level crossing between Cambridge and Ely just after 2.30pm today.
All train services on the line have been cancelled while emegency services deal with the incident.
National Rail said major delays were expected on the East Coast main line until at least 7pm.
It said in a statement: "A train has hit an obstruction on the line near Waterbeach and this is causing disruption to journeys between Ely and Cambridge.
"Trains between these stations may be cancelled, amended or delayed by up to 60 minutes. Disruption is expected to continue until 7pm."
An East of England Ambulance Service spokesman said: "A train has hit a vehicle on the line between Cambridge and Ely, with a man in his forties being treated for a severe head injury."
British Transport Police said in a statement: "We are currently on the railway line between Cambridge and Ely after a train has struck a vehicle on a level crossing. Police were alerted just after 2.30pm.
"A man has been airlifted to hospital with serious head injuries. There are no other reported injuries at this time."
This page is being updated.
