There are delays of up to one hour on East Coast main between King's Cross and the north through Peterborough due to a broken down freight train between Newark North Gate and Retford.
A rescue train is being sent to move the affected train. There is currently no estimate for when a normal service will resume.
Abellio, who run the Greater Anglia rail line, has been named Train Operator of the Year at the annual national Rail Business Awards.
Greater Anglia train operator Abellio says it's made real steps in customer service and punctuality in its first year in charge.
Greater Anglia have apologised for the delays that have disrupted services today