East Coast have confirmed that none of their trains are running in or out of London King's Cross.
All southbound trains are terminating early and there is no indication of when services will be resumed.
The company says the storm has affected overhead power lines and flooded the tracks in places.
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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.