Overview

• Rollout of 94 new Piccadilly line trains is now set for the second half of 2026, with the complete fleet expected in service by early 2028.
• The postponement reflects unexpected challenges fitting the first new train into London Underground’s ageing infrastructure under real operating conditions.
• Testing of train-infrastructure interactions has been rescheduled to summer 2025 to allow TfL and Siemens to resolve alignment and system integration problems.
• The trains will be the first deep-level Tube stock with onboard air conditioning, and they feature 10% increased capacity, wider double doors, walk-through carriages and CCTV.
• Siemens built the first train in Vienna, and the remaining 79 units are due to be assembled at its Goole factory in East Yorkshire.