Fire brigades in the region are training members of the public to cover fire fighters in case a national strike goes ahead.
Some of those who have volunteered are having intensive training this week, with hundreds having applied for the positions in Middlesbrough.
Members of the Fire Brigade Union have voted in favour of a strike in a row with the government over their pensions.
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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.