Delays of up to 30 minutes on East Coast between Kings Cross and Doncaster due to signalling problem at Peterborough.
Mainly affecting northbound services.
Trains are running at reduced speed through the affected area, resulting in delays.
There is no estimate for a normal service.
More top news
Chilly start, some frost, any mistiness clearing and brighter breaks developing
Emma Jesson brings you Sunday night's forecast
Not too much rain in the forecast outlook, apart from on Wednesday