A second group of Virgin Trains West Coast workers will join a string of six 24-hour strikes in December and January in a dispute over pay.
Members of the Rail, Maritime and Transport Union already announced they are to walk out for six days in the run up to Christmas on December 15 and 22 and also on January 5, 8, 26 and 29.
On Friday a second union, the Transport Salaried Staffs Association, revealed its members who work in ticket offices and platforms will join the six days of walkouts as the union's boss accused Richard Branson of “behaving like Scrooge”.
Both union leaders say they want a similar pay deal to the one agreed with train drivers.
Around 1,800 RMT members including train managers, on-board catering staff, station and clerical workers will be involved in the walkouts.
TSSA members will stage industrial action at stations from Glasgow to London Euston.
Virgin said it will run the majority of its services during the strikes.
Passengers take more than 37 million journeys every year on the west coast route, which serves 49 stations between London and Scotland including Birmingham, Liverpool and Manchester.
TSSA leader Manuel Cortes said: "Our members are genuinely shocked and upset that the company is not treating them fairly.
"They put in as hard a shift as anyone else within Virgin West Coast and expect pay justice. Frankly, for the company to cherry-pick drivers for a pay deal that is better than the rest of their staff is not only insulting but terrible management.
"Nobody wants to be on strike at Christmas time and nobody has to be if Richard Branson stops behaving like Scrooge and starts treating his workers fairly and equally."
Phil Whittingham, managing director for Virgin Trains on the west coast, said: "The TSSA's leadership is attempting to cause disruption when many will want to travel by train to spend time with loved ones.
"We have explored a generous 3.6% pay increase, however the trade union's leadership is insisting on 4 per cent, double the 2 per cent average increase seen across the UK this year.
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"We know how important it is for friends and families to get together over the festive season, so we will keep the majority of our trains running with fully-trained staff onboard and at stations. We remain open to continuing talks with the TSSA."
