Six years of disruption on the District Line’s Wimbledon branch now has an official explanation: fixing it requires a government funding decision that has not been made. Documents released under freedom of information confirm the branch will remain on 1980s signalling indefinitely.
Political pressure has produced some real results. Following a highly public failure during Wimbledon last year, when the Mayor of London apologised to affected passengers, improvements were commissioned last autumn that should make this summer’s Championships far less disrupted. But that is the limit of what TfL and Network Rail can do within the current arrangement.
A new £200-300k update package – repeatedly referenced by the Liberal Democrats during this election season – deploys sensor instrumentation, fault-logging technology, and early warning systems for heat and flooding on the existing infrastructure.
It is not a replacement of the signalling system.
Commissioning is planned for 13 to 14 June, though issues may still arise. That is 16 days before Wimbledon begins. Meeting notes obtained by Putney.news cover a private February meeting between TfL, Network Rail, and Wimbledon MP Paul Kohler, and they also record him asking that communications about the work “should not mention the tennis.”
Network Rail’s response to the freedom of information request included an unsolicited note: Kohler had expressed concern that the work should not be portrayed as completed solely for the Championships, but for passengers more generally.
The Wimbledon branch was sold by British Rail to London Underground for a nominal £1 in April 1994, a privatisation-era settlement that split ownership from operations. TfL owns the track, the stations, and the assets. Network Rail operates and maintains the signalling under contract, because South Western Railway mainline trains also use the line. As we documented last month, East Putney produced more signal disruption in 2024 than any other station on the network.
Any modern automatic train operation (ATO) system requires every train on the route to carry compatible equipment. TfL’s District Line trains are fitted. South Western Railway’s fleet is not, and SWR trains gain nothing from being retrofitted for a four-mile stretch of someone else’s network.
The result is that District Line passengers are left in limbo, stuck between two organisations who simply don’t think it is worth the time, money or effort to get the District Line up to speed with the rest of the Tube network.
Ultimately, the decision sits with TfL: Network Rail confirmed in its FOI response that it is a contractor on the branch with no funding decisions, budget allocations, or timeline documents for any signalling replacement. The meeting notes record the conclusion on automation: “not feasible within any reasonable planning horizon, never say never, but given the current trains and operational reality.” The decision that would change this sits with the Department for Transport.
What TfL’s board decided
The clearest statement of where this ends came not from the February meeting but from TfL’s own governance papers from two years ago. A Programmes and Investment Committee paper from June 2024 stated:
“District line will not be re-signalled. This means sections of the District line south of East Putney and west of Stamford Brook will remain under the existing signalling. Journey times in these sections will remain unchanged.”
That decision followed a recommendation in December 2020 from TfL’s Major Projects Director, Stuart Harvey, to remove the Wimbledon branch from the Four Lines Modernisation programme. Today, 57% of the Tube network operates under automatic train control. ATO-equipped lines account for only 21% of signalling-related failures. The Wimbledon branch is not among them.
At February’s meeting, TfL and Network Rail were candid about what reversing that position would cost.
Full modernisation “would require hundreds of millions of pounds,” including fitting South Western Railway’s fleet with compatible equipment, a programme that delivers no benefit to SWR passengers. No commercial operator funds that without a government mandate.
Nine days after the February meeting, Paul Kohler MP told his constituents that TfL and Network Rail had “now confirmed funding to modernise the existing local signalling system between Wimbledon and East Putney.”
At the Southfields ward hustings on 21 April, Lib Dem candidate Sue Wixley said the party had “secured agreement from TfL to fix the really ancient signalling infrastructure.” Her fellow candidate Fergus Foord described the money as secured and work happening “on the track at night, upgrading the line as we speak.” Labour’s Peter Watts offered the most technically precise description: the project “doesn’t amount to full resignalling, but it will upgrade the track circuits and association monitoring.” Green candidate Kester Leek called it “tinkering around the edges,” a description the FOI disclosure broadly supports.
The word “modernise” in Kohler’s statement carries more weight than the February meeting could support. What was confirmed was a monitoring upgrade. No plan to replace the signalling system exists. The gap between what Kohler was told and how he described it publicly may reflect genuine belief. But the same structural problem faces any party: the decision sits at the Department for Transport, not at City Hall.
As we reported in March, Kohler’s 9 March statement and Network Rail’s public line at the time could not both be true. In April, James Wilson, the Lib Dem candidate for Thamesfield ward, challenged our coverage, citing Kohler’s statement as evidence of confirmed funding. We replied that if the outstanding FOI requests produced evidence of a funded programme with a committed date, we would correct the record. The FOI has been answered. It produced no such evidence.
What would change this
Three engineering routes to modern signalling on the branch exist. All three require a capital funding decision from the Department for Transport. The most plausible would see the branch designated for European Train Control System Level 2 as part of Network Rail’s next investment programme, running from 2029 to 2034. That system is already in passenger service on parts of the UK rail network. The cost would still run to hundreds of millions. The decision has not been made.
Readers who want to push on this should write to their Westminster MP, because the authority to act is national, not local. The right target is the Department for Transport. Putney.news will file a further FOI request to TfL seeking the funding decision and budget approval for the upgrade and any Championships operational readiness plan.
Network Rail’s FOI response also contained a procedural anomaly: commercial interests were cited to justify an extension on 1 April, then not applied in the final response on 30 April. No explanation has been offered.
The questions about what we can do about the worst performing branch of the Tube system – and the ones Putney residents unfortunately are subject to every day – are not closed. They are just better defined. What would fix the Wimbledon branch is not another meeting. It is a decision, at the Department for Transport, to fund a solution that neither TfL nor Network Rail can afford to make alone.
