The RMT union, which is run by Mick Lynch, said its members on the route will walk out for five days, starting on the weekend.
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A Hitachi Rail spokesperson said: “We are disappointed at RMT’s decision to carry out industrial action.
“We believe the combination of last year’s pay increase, and this year’s pay proposal, is fair and highly competitive in the current economic environment. As demonstrated by Unite members accepting the same offer this week and ending their planned industrial action.
“We will continue to work with the RMT to find a solution. In the meantime, we have enacted contingency plans to mitigate the impact of industrial action.”