Weekend Piccadilly Line Closures To Prepare for New Trains
Fleet to be tested ahead of planned December introduction
Two of the new trains being tested at Northfields station. Picture: TfL
May 21, 2026
West London tube passengers are being urged to plan ahead this summer as Transport for London (TfL) carries out a series of part closures on the Piccadilly line to prepare for the arrival of its new fleet of trains. The works, which will affect sections between Acton Town, Heathrow, and Uxbridge, mark a crucial stage in testing and upgrading infrastructure before the first of the next-generation trains enters service.
Currently it is expected the fleet will start to be introduced from December 2026 and be full operational by June 2027.
The closures, mostly at weekends but including some weekday periods during school holidays, will allow engineers to complete power, track and platform upgrades and to test how the new trains interact with the existing network. The Piccadilly line’s west-end branches — serving Hammersmith, Ealing, Hounslow and Heathrow — will see the most concentrated activity, reflecting the complexity of the line’s shared sections with the District line and its role as a key link to the airport.
TfL says the work is essential to ensure reliability once the new trains begin running. The current fleet, dating from 1975, is nearing the end of its operational life. The replacement trains will feature walk-through carriages, air-conditioning, wider doors, and real-time digital information screens — a major step forward for comfort and accessibility on the deep-level network. The timetable for their introduction has already been pushed back several times as the technical challenges proved to be greater than expected.
Closures are scheduled from Thursday 28 to Sunday 31 May, when the line will be shut between Acton Town and Heathrow, and between Rayners Lane and Uxbridge. Further closures will follow in late July and August, including weekday shutdowns between Cockfosters and Uxbridge. During these periods, the Metropolitan line will continue to run between Rayners Lane and Uxbridge, offering an alternative route for passengers in the area.
TfL has already completed extensive preparatory work, including platform modifications at 119 stations to accommodate the longer trains and weight-load testing using a fully loaded test train. In the Hounslow area, engineers will renew points and carry out maintenance to improve reliability for years to come. Stuart Harvey, TfL’s Chief Capital Officer, said the closures were “a necessary part of introducing a new fleet of trains — a huge engineering and logistical feat that requires intensive testing and infrastructure upgrades.”
The new trains will increase capacity by 10 per cent per train and allow frequency to rise from 24 to 27 trains per hour, boosting peak capacity by 23 per cent in central London. They will also consume 20 per cent less energy, contributing to TfL’s wider sustainability goals.
TfL acknowledges that closures will disrupt journeys but says weekday work has been timed for school holidays when demand is lower. Posters, announcements and direct notifications to regular users will provide travel advice, and TfL’s Journey Planner and TfL Go app will offer real-time updates.
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