The line has reopened and rail services resumed after reports that a person had been hit by a train at Sleaford.
The incident was reported at about 6.40am, according to an East Midlands Trains spokesman and the lines were temporarily closed between Sleaford and Boston.
Some trains were cancelled and others diverted
Some residual delays were expected to occur as a knock on effect of the disruption, said an East Midlands Trains statement.
An East Midlands Trains spokesperson said: “Services were disrupted this morning between Boston and Sleaford after a person was hit by a train around 6.40am near Sleaford. Our first thoughts are with the family of the person involved.
“The line was reopened around 8.20am but there will be some residual delays while services recover.”
A British Transport Police spokesman said: “We were called to the line south of Sleaford station shortly after 6.30am, after reports a person had been struck by a train.
“Lincolnshire Police and East Midlands Ambulance Service also attended, but a man was pronounced dead at the scene.
“We are working to make a full identification of the man, whose death is not being treated as suspicious. His next of kin has been informed.
“We will prepare a file for the coroner.”