Delays of up to one hour on CrossCountry between Birmingham New Street and Glasgow Central, and between Newcastle and Reading due to flooding at Darlington.
There is no current estimate for when a normal service will resume. Also affecting East Coast and First TransPennine Express services.
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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.