London’s iconic Underground system is bracing for a fresh wave of strikes as the Rail, Maritime and Transport (RMT) union confirmed a series of 24-hour walkouts over the next few months, threatening widespread disruption for millions of commuters and visitors. The dispute, which centers on a controversial proposal to compress the working week for train drivers, has left negotiations deadlocked and both sides digging in their heels.
According to the RMT, drivers will stage walkouts beginning at noon on April 21 and April 23, with additional strikes planned for May 19, May 21, June 16, and June 18, 2026. Each strike will last from 12 noon on the first day to 12 noon the following day, but Transport for London (TfL) warns that the impact will ripple through the afternoons and evenings, with services slow to return to normal.
The catalyst for industrial action is TfL’s plan to introduce a four-day working week for drivers, compressing the current 36-hour, five-day schedule into a 35-hour, four-day pattern. The union claims this would mean longer shifts—up to eight hours and 45 minutes per day—raising alarms about driver fatigue and passenger safety. RMT general secretary Eddie Dempsey did not mince words, stating, “London Underground is trying to force through major changes to working patterns that have already been rejected by our members. We are clear that these proposals raise serious concerns around fatigue, safety and work-life balance.”
Dempsey further expressed frustration at the negotiating table. “We have approached negotiations with TfL in good faith throughout this entire process, but despite our best efforts, TfL seem unwilling to make any concessions in a bid to avert strike action. This is extremely disappointing and has baffled our negotiators,” he said, according to London Centric. “There is still time for London Underground to come up with a workable solution but we will take strike action if we cannot get a negotiated settlement.”
At the heart of the standoff is a fundamental disagreement about how best to modernize working patterns without jeopardizing safety or morale. TfL maintains that the proposed four-day week is both voluntary and limited to Bakerloo line train drivers. Claire Mann, TfL’s chief operating officer, explained, “We have set out proposals to the RMT for a four-day working week. This allows us to offer train operators an additional day off, whilst at the same time bringing London Underground in line with the working patterns of other train operating companies, improving reliability and flexibility at no additional cost.”
Mann emphasized that no one would be forced to switch: “The changes would be voluntary, there would be no reduction in contractual hours and those who wish to continue a five-day working week pattern would be able to do so.” She added that the proposal “brings London Underground in line with the working patterns of other train operating companies.”
Despite these assurances, the RMT is adamant that the changes could lead to longer, more exhausting shifts, with potential knock-on effects for both staff and passengers. The union’s concerns go beyond shift length; they also cite issues with working time arrangements, transfer and allocation processes, and the broader impact on work-life balance. “Despite our best efforts over many months, no satisfactory outcome has been reached so we have no choice but to call strike dates,” Dempsey said in March.
The dispute has been simmering since April 2025, when rival union Aslef, which exclusively represents train drivers, accepted TfL’s four-day week proposal, calling it “exactly the sort of deal every trade union should be trying to achieve.” According to BBC, TfL has been trialing the new working pattern on the Bakerloo line, with shifts available to all drivers on a voluntary basis. Yet, RMT’s membership remains unconvinced, having rejected the compressed week in a recent referendum.
As the strike dates approach, TfL is urging the union to reconsider. “TfL is working hard to resolve the dispute, with dialogue with the union ongoing, and will operate as many services as possible should strikes go ahead,” the agency said in a statement. Passengers are being advised to check before they travel, as services will vary considerably across lines. While some normal operations are expected in the mornings of strike days, significant disruption is anticipated after midday, continuing through the afternoon and evening. On the days following strikes, TfL expects lingering delays until services can be fully restored.
The effects won’t be limited to the Underground. Buses are expected to run normally, except for seven routes operated by Stagecoach from Bow Bus Garage, which are facing their own separate 24-hour strike action on April 17, April 24, and May 15. These bus strikes, starting at 5am and ending the following morning, add another layer of complexity to the capital’s transport woes.
Nick Dent, TfL’s director for London Underground customer operations, highlighted the financial realities of the negotiations. In an email to staff last September, Dent noted that a small reduction in contractual hours would cost “tens of millions of pounds,” a figure that TfL says is “neither practical nor affordable.” The current proposal, by contrast, is designed to avoid extra costs while offering greater flexibility. Mann echoed this sentiment, stating that the four-day week “would be voluntary and at no additional cost.”
For many Londoners, the looming strikes bring a sense of déjà vu. Two previous RMT walkouts, scheduled for March, were called off at the last minute following talks. This time, however, the April, May, and June dates remain firmly on the calendar, with neither side showing signs of backing down. The result is a tense standoff that could leave the city’s transport network in turmoil for weeks to come.
Commuters are being urged to plan ahead, with TfL warning that all other normally operating services—such as the Elizabeth line, DLR, London Overground, and trams—are likely to be far busier than usual during the strikes. The agency has pledged to run as many trains as possible, but significant gaps in service are expected, especially on the lines directly affected by the industrial action.
As the city prepares for yet another round of strikes, the stakes feel higher than ever. On one side are workers determined to protect their health, safety, and work-life balance; on the other, a transport authority under pressure to modernize, cut costs, and keep London moving. Whether a compromise can be found before the first whistle blows at noon on April 21 remains to be seen. For now, Londoners are left watching the clock and weighing their travel options, hoping for a last-minute breakthrough that might keep the capital on track.