A person has been hit by a train between Sleaford and Spalding this afternoon, Wednesday, closing all rail lines.
There is no firm estimate yet of how long disruption will last but it is likely to continue until at least 8pm.
British Transport Police have been informed but there are delays on trains between Peterborough and Lincoln/Doncaster.
British Transport Police are on site along with emergency services and Network Rail staff.
Virgin Trains are accepting East Midlands Trains tickets between Peterborough and Doncaster.