Trains heading north from Bedford are being severely delayed as emergency services attend a person on the track.
The incident, in which a person is believed to have died after being struck by a train, is near Market Harborough, Leicestershire.
East Midlands Trains has said while the line has reopened delays of up to 30 minutes between Bedford and Leicester/Corby are expected while services return to normal. This is expected to continue until 13:00.
They added: “Alternative travel options: Passengers may use Virgin Trains East Coast between London Kings Cross and Doncaster.”
A spokesman for British Transport Police said: “We were called to Market Harborough station at 8.52am on Tuesday, 17 November to reports of a person being struck by a train.
“Colleagues from Leicestershire Police, and East Midlands Ambulance Service also attended, and a person was pronounced dead at the scene.
“The incident is not being treated as suspicious, and officers are now working to identify the person and inform their family.
For more information, go to www.eastmidlandstrains.co.uk