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
The MP for Newcastle Central, Chi Onwurah, has started the formal process to see Hollywood producer Harvey Weinstein stripped of UK honour.
It comes as households already face a triple-whammy from airfares, fuel and electricity prices.
Firefighters are urging residents to be extra vigilant if using candles over the winter months and during the Hindu festival of Diwali.