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
Sunderland's winless home run extended to 20 games on Saturday as they drew 2-2 with Millwall at the Stadium of Light.
Kerrie brings you Saturday's forecast
AC/DC co-founder and ex-guitarist Malcolm Young has died aged 64, his publicist has announced.