Rail workers on Virgin West Coast trains have voted by nine to one to go on strike in a dispute over pay, the RMT union announced.
The union said the dispute involves almost 1,800 train managers, on-board catering staff, station and clerical employees.
RMT said it was seeking a "suitable and equal" pay offer to one received by drivers, who the RMT said had been given a £500 rise.
More than 90 per cent of members that voted in the ballot voted in favour of strike action.
There was an 82 per cent turn out in the ballot.
RMT General Secretary Mick Cash said: “Our members have voted overwhelmingly for action in this ballot which is all about workplace equality and workplace justice.
“All our members are demanding is a suitable and equal offer to that given to drivers to buy out their claim for a reduction in the base working week. We have made it clear to the company that the inequality and underhanded approach of Virgin will be fought tooth and nail. We will not accept our members being dealt with less favourably than others.
“The result will now be considered by the union’s executive and we remain available for serious talks aimed at righting this wrong.”
A spokesman for Virgin Trains said: "We are disappointed by the result of the RMT's ballot, but can reassure customers that we will be able to run the majority of services during any industrial action.
"We have offered a 3.2 per cent annual pay increase at a time when the average increase across public and private sector employees is around two per cent. We remain open to continuing talks with the RMT."
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