The London Underground is facing two 24-hour strikes by the Rail, Maritime and Transport union (RMT) this week, set to shut the Circle and Piccadilly lines entirely and cause partial closures on the Metropolitan and Central lines. The industrial action, scheduled for tomorrow and Thursday, stems from a dispute over Transport for London's (TfL) voluntary four-day working week pilot on the Bakerloo line. Last-minute conciliation talks through Acas were arranged today, according to the report, but the RMT says TfL has not properly engaged with safety concerns.

Why the RMT says longer shifts create a safety risk on the Tube

The core of the RMT's argument is that compressing a five-day workload into four longer days could lead to driver fatigue, reduced flexibility, and increased safety risks in what the union calls a safety-critical role. as the source notes, the union maintains that its members have genuine concerns that TfL must address before any roster changes are implemented. TfL's Chief Operating Officer, Claire Mann, has responded that safety will never be compromised and that the new system is entirely voluntary, with drivers able to remain on a traditional five-day pattern.

Circle and Piccadilly lines go dark on two days this week

The planned disruption will see the complete suspension of the Circle and Piccadilly lines, along with partial closures on the Metropolitan and Central lines. Services across the network will start later and finish earlier,with no trains running before 6:30am or after 9:00pm, according to the report. Some residual disruption is expected on the following mornings. while London Overground, the Elizabeth line, DLR, buses and trams will continue to operate, they are anticipated to be much busier than usual.

The Bakerloo line pilot that sparked the standoff — voluntary but divisive

The dispute centres on a voluntary pilot programme on the Bakerloo line, which TfL says has already attracted significant interest from drivers. TfL argues the proposals aim to improve work-life balance. However, the RMT has accused London Underground of refusing to properly engage with legitimate safety and workplace concerns. The source reports that a similar RMT stoppage in April resulted in TfL operating around half its services, yet passenger demand remained high, reaching 94 percent of normal levels on the final day — a statistic that may embolden TfL in its negotiating stance.

Eddie Dempsey's inflation math — RPI vs CPI split and the 'winter of discontent' threat

The broader context includes reports of union leaders planning a 'winter of discontent' to push for inflation-busting pay rises. RMT union boss Eddie Dempsey has demanded pay increases above the Retail Price Index (RPI), which was over 4 percent at the time of the report, while the Consumer Price Index (CPI) has since fallen to 2 percent. The source notes that any national ballot is not expected until after the summer.. This ongoing dispute highlights the tension between modernising work practices and addressing workforce concerns, with safety and passenger impact at the forefront.

What remains unknown after TfL and the RMT's duelling statements

Several open questions persist. TfL has not disclosed how many of the 2,000 driver workforce the Bakerloo line pilot would cover, nor whether the four-day schedule would include mandatory overtime. The RMT's claim that TfL refused to engage meaningfully is countered by TfL's insistence that negotiations are ongoing — the source reports last-minute talks through Acas but offers no detail on what is being proposed. Finally, it remains unclear whether the passenger demand resilience seen in April will repeat, potentially reducing pressure on TfL to make further concessions.