Network Rail workers in the RMT union have voted by an 80% majority to strike in a dispute over pay and job security.
The strike ballot had a 60% turnout, with 92% voting for action short of strikes. The high turnout and substantial majority mean the ballot would pass the stringent tests the Tories propose to introduce for industrial action ballots.
Workers have rejected a deal which includes a one-off, non-consolidated payment in year one, and increases pegged to RPI in years two, three, and four. Under the terms of the offer, a "no compulsory redundancies" guarantee would expire after 2016.