Network Rail workers are set to stage two strikes next month after a new pay offer was rejected.
Members of the Rail, Maritime and Transport (RMT) union will walk out for 24 hours from 5pm on June 4 and for 48 hours from 5pm on June 9.
A planned strike over the Bank Holiday in May was suspended after Network Rail tabled a fresh pay offer.
The new offer was for a two-year deal, a 1% pay rise this year and around 1.4% next year, with no compulsory redundancies for the duration of the agreement.
But RMT general secretary Mick Cash said: "Our representatives have today rejected the pay package offered by Network Rail and, in the absence of any further movement from the company, that has left us with no option but to move to a rolling programme of industrial action.
"Our rail staff deserve a fair reward for the high-pressure, safety-critical work that they undertake day and night and the last thing that we need is a demoralised, burnt-out workforce living in fear for their livelihoods and their futures, and the message has come back loud and clear that that is exactly how they feel about the current offer from Network Rail.”
The Queen's Speech on Wednesday (May 27) included a Bill which will require unions to achieve a turnout of at least 50% for a strike to be valid, while in transport, health, fire and education, 40% of those entitled to vote must back action.
The Government said the aim of the Bill was to ensure that strikes are the result of "clear, positive and recent decisions" by union members as well as ensuring that disruption to essential public services had a democratic mandate.
