Replacement bus service running on Northern Rail between Seaham and Nunthorpe due to landslip at Hartlepool.
Trains are only running between Hexham and Seaham. Journeys extended by up to 45 minutes.
Northern Rail do not have an estimate for normal service.
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The constituency of Washington and Sunderland West includes the UK's largest car plant, which was opened by Nissan in 1984.
This seat was formed prior to the 2010 General Election, taking in Sunderland city centre and the Ryhope area to the south.
The constituency of Stockton South includes relatively affluent areas like Yarm and Eaglescliffe.