New Piccadilly Line Trains for Harrow Stations
Sudbury Hill, South Harrow and Rayners Lane will receive updated Siemens Mobility trains replacing the 1975 fleet.
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Passengers using Sudbury Hill, South Harrow, and Rayners Lane Tube stations will soon see new Piccadilly line trains introduced. Transport for London (TfL) has confirmed the update on its long-awaited fleet upgrade programme. The new trains are part of a phased rollout scheduled between December 2026 and June 2027.
Fleet Replacement and Features
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The new trains, manufactured by Siemens Mobility, will replace the current Piccadilly line fleet which has been operating since 1975. Key improvements include walk-through carriages, air conditioning, a first for deep-level Tube trains, and wider double doors to facilitate easier boarding and alighting. Passengers will also benefit from improved digital information screens and onboard CCTV. Each new train is designed to carry approximately 10 per cent more passengers than the existing ones. Once all 94 trains are in service, TfL anticipates increasing peak-hour train frequency in central London from 24 to 27 per hour, boosting capacity by 23 per cent.
To support the larger fleet and enhance reliability, TfL is also undertaking upgrades to tracks, power systems, and maintenance depots.
Planned Closures and Passenger Concerns

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The upgrade programme will necessitate a series of planned Piccadilly line closures. These are required for engineers to carry out infrastructure work and continue testing the new trains. TfL stated that most closures will occur on weekends, with some weekday closures also scheduled, primarily during school holidays. Despite the latest update, some passengers have voiced concerns about potential further delays to the project, referencing previous postponements. One user on X questioned the project's adherence to its timetable, noting that the 2024 stock is now not expected until 2027. Another commenter expressed excitement for the trains but sought clarification on how service disruptions would be managed during the transition.
TfL maintains that the upgrade will result in a more reliable, accessible, and sustainable railway service.
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