Tube strike: RMT announces London Underground walk out
More London Underground staff are to strike on 15 March, Budget Day, a transport workers' union has announced.
The RMT has announced the walkout, which is in a dispute over pensions, job losses and contractual agreements.
Members will walk out on the same day that Aslef members are striking on the Tube network.
A spokesperson for Transport for London (TfL) said: "We have not proposed changes to anyone's pensions."
But the RMT's general secretary Mick Lynch said: "Our members will never accept job losses, attacks on their pensions or changes to working conditions in order to pay for a funding cut which is the government's political decision.
"Tube workers provide an essential service to the capital, making sure the city can keep moving and work long hours in demanding roles.
"In return they deserve decent pensions, job security and good working conditions and the RMT will fight and tooth nail to make sure that's what they get."
Nick Dent, director of customer operations at TfL, said: "We have been working with our trade unions to see how we can make London Underground a fairer and more sustainable place.
"We want to make London Underground a better place to work so we urge Aslef and the RMT to call off this damaging strike and continue working with us."
A national RMT rail strike has already been announced for 16 March.
In 2022 there were six 24-hour strikes by the RMT in the ongoing dispute.
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