London Underground Strike Wave Continues as RMT Disputes Four-Day Week Implementation

The Rail, Maritime and Transport Workers (RMT) union extended its campaign of rolling strikes on the London Underground network into June 2026, with strike action taking place on June 3 and scheduled for June 4, as the dispute over Transport for London's implementation of a compressed four-day working week for Tube drivers remains unresolved.

The Guardian reported that 11th-hour negotiations at the Advisory, Conciliation and Arbitration Service (Acas) between RMT representatives and Transport for London failed to prevent the June strikes, with approximately half of London Underground drivers participating in the Tuesday action.

Division Between Driver Unions

The industrial action has exposed a significant split within the Tube driver workforce. While the RMT opposes the four-day week proposals as a safety risk, the Associated Society of Locomotive Engineers and Firemen (Aslef) union, which represents a slight majority of London Underground drivers, has welcomed the compressed working arrangements and did not participate in the strike action.

This division has limited the operational impact of the strikes compared to coordinated action across both unions. London Underground has been able to maintain some services using Aslef members and management drivers during RMT strike periods.

Extended Campaign Timeline

The current dispute represents the culmination of months of escalating industrial action. The RMT initially scheduled strikes for March 24-25 and 26-27, followed by actions on April 21-22 and 23-24. The union then planned strikes for May 19-20 and 21-22 before adding the June dates.

The RMT suspended some strikes following what it described as progress in talks with London Underground management, but subsequently added additional strike action scheduled for June 16 and 18 as negotiations stalled.

The union has consistently argued that London Underground bosses pushed ahead with the compressed working week despite the proposals being rejected by a majority of Train Operators in internal e-referendums conducted among drivers.

Historical Context and Union Position

The four-day week demand has deep roots in RMT industrial strategy. In 2015, during disputes over the introduction of the Night Tube service, the union's demands included a 32-hour, four-day week and exemption from Night Tube duties for London Underground staff.

However, the current dispute centers not on reducing total working hours, but on management's decision to compress existing working patterns into four days rather than the traditional five-day schedule. The RMT has characterized this as a "fake four-day week" and raised safety concerns about driver fatigue under the compressed arrangements.

The RMT accused TfL of making a U-turn in negotiations in April, suggesting that previously agreed positions were being reversed during talks.

Operational Impact and Wider Context

The strikes have occurred alongside other transport disruption in London. Separate strike action affected Stagecoach bus routes between 05:00 on Friday, April 24 and 05:00 on Saturday, April 25, 2026, adding pressure on alternative transport modes during the Tube strikes.

Under general secretary Eddie Dempsey's leadership, the RMT has maintained its opposition to what it views as unilateral management decisions on working conditions. The union's position reflects broader tensions over workplace flexibility arrangements that have emerged across multiple sectors since the pandemic reshaped working patterns.

Looking at what this means for London's transport network, the persistence of this dispute through multiple strike cycles suggests fundamental disagreement over the implementation of flexible working arrangements in safety-critical operations. The split between the two main driver unions complicates resolution, as management faces different positions from different worker constituencies on the same policy.

We have seen this pattern before, when the introduction of the Night Tube in 2015 generated similar sustained industrial action over working arrangements. That dispute ultimately required months of negotiation and compromise on both sides before reaching resolution. The current impasse over compressed working weeks may follow a similar trajectory, with neither side appearing willing to make significant concessions at this stage.

Future Implications

The ongoing dispute raises questions about how transport operators will implement post-pandemic workplace flexibility in operational environments where continuous service coverage is essential. The divergent positions of the RMT and Aslef unions suggest that worker preferences on compressed schedules are not uniform, complicating policy development.

With additional strikes scheduled for mid-June, the dispute shows no immediate signs of resolution. The failure of Acas-mediated talks in early June indicates that the positions remain far apart, particularly on safety concerns raised by the RMT regarding compressed working patterns.

The outcome of this dispute may influence similar discussions across other transport operators and safety-critical industries where compressed working arrangements are being considered as part of broader workplace flexibility initiatives.