London Underground drivers are to stage a series of 24-hour strikes in a long-running dispute over working arrangements, the Rail, Maritime and Transport (RMT) union has announced.

A series of walkouts will begin on 26 November in opposition to plans to introduce four-day working weeks.

Further strikes are planned for 17 December, 19 December, 4 January, 6 January, 17 February, 23 February and 25 February.

The union says drivers will face longer hours behind the wheel and longer days, but Transport for London (TfL) previously said its proposal for a four-day working week was voluntary and would mean drivers work fewer hours overall.

A series of strikes in the spring over the same issue caused significant disruption across the network, with some lines being entirely closed.

RMT general secretary Eddie Dempsey said: “London Underground is attempting to dress up a wholesale attack on drivers’ working conditions as a voluntary four-day week.

“But there is nothing voluntary about a scheme that forces drivers to give up existing protections whether they work four days or five, and threatens those who refuse with displacement from their depots.

“Our members are being asked to spend more time driving trains, accept longer and more unpredictable shifts and surrender agreements that have been negotiated and defended over many years.”

About half of the drivers on the network are members of the RMT union. Many others are represented by the Aslef union.

Finn Brennan, Aslef’s full-time organiser on London Underground, said: “We are surprised that the RMT has, once again, decided to take strike action to try to prevent Underground drivers moving to a four-day week on a voluntary basis.

“The voluntary four-day week gives Tube train drivers an extra 35 days off every year with rosters based on a 34-hour week in return for some changes to working conditions and moving to electronic, rather than paper-based, systems for booking on for duty.

“Management have agreed that anyone who wants to keep working a five-day week will be able to do so without suffering any detriment, and we will be holding them to that.

“A strike designed to stop people having the choice of a shorter working week and more time off is a strange choice to make.”

Under the proposals, most drivers would see their working week reduced from 36 hours to 35 hours, according to TfL.

Their contractual hours would remain the same because paid meal breaks would be introduced.

This effectively means drivers would work longer days, but fewer days each week and fewer overall hours each week.

The RMT instead wants a 32-hour week over four days, meaning drivers would work three fewer hours each week for the same salary.

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