Signalling problems at Eaglescliffe causing delays of up to 30 minutes on First Transpennine Express between Northallerton and Middlesbrough.
Also causing delays of up to 30 minutes on Grand Central Trains between Northallerton and Sunderland, and on Northern Rail between Darlington and Saltburn.
There is currently no estimate for when a normal service will resume.
More top news
Police were called to reports of a disturbance inside the Prince Edward pub on Wednesday night.
Northumbria Healthcare NHS Foundation Trust has been rated as 'outstanding' by the Care Quality Commission.
Archeologists in America say a ship wreckage found at the bottom of a harbour is that of Captain James Cook's Endeavour.