There is disruption on East Coast rail line between Newcastle and Kings Cross, and between Leeds and Kings Cross, due to overhead line problems at St Neots.
Tickets are being accepted on the CrossCountry, East Midlands Trains, First Transpennine Express, and Virgin Trains services.
Replacement buses are operating between Peterborough and London, although a very limited number of trains can run via Cambridge.
Services are not expected to run via St Neots until later this afternoon, but with disruption for the rest of the day.
More top news
People have gathered in the city centre to call upon the labour parliamentary party to accept what they Corbyn's 'democratic mandate'.
Officers were informed that the body of a man in his 60s had been found in a property in North Tyneside on Friday night.
Davey Hopper's funeral was held at the Miners' Association building today where he'd been secretary for over 30 years.