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.
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There are 66 candidates standing in the Tyne and Wear area in the General Election on June 8
Richard Vincent, 32, of Southmead Avenue in Blakelaw, was last seen in Newcastle city centre near to Spital Tounges.
There are 32 candidates standing in the Tees Valley area for the 2017 General Election