Last month train drivers voted in favour of a pay deal bringing two years of industrial action to a close.
London Underground members have secured a fresh mandate for strike action as pay negotiations continue.
The RMT union said it was “wholly unacceptable” that its members would be subject to different pay increases under management changes from the London Underground.
RMT revealed plans to meet with the employer to reach a negotiated settlement.
No strike dates have been announced as of yet.
Mick Lynch, general secretary of the RMT, said: “Our members on London Underground are sending a clear message to management that they will not put up with substandard pay offers or any attempt to treat members unequally in any pay deal.
“We are always willing to find solutions to industrial relations issues, but our members will not tolerate an imposition of any pay deal where members are not being treated equally or fairly.”
UKHospitality said the sector had lost £4b in sales as a result of the dispute, part of which drew to a close last month after an overwhelming majority of train drivers voted in favour of a pay deal.
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