Delays of up to one hour on East Coast between Edinburgh Waverley and York due to earlier broken down train at Morpeth.
The southbound line has re-opened and trains can run through the affected area with delays and possible cancellations.
There is no estimate for a normal service. Also affecting CrossCountry.
More top news
Emma Jesson brings you Sunday night's forecast
Cold and clear with widespread frost on Sunday night. Sunny Monday then showers
A number of Britons are feared stranded on Mount Everest after the Nepal earthquake triggered a deadly avalanche on Saturday.