Overview
- The Elizabeth line was suspended between London Paddington and Reading and Heathrow on Wednesday after overnight engineering works overran, with National Rail warning of cancellations and delays of up to 45 minutes.
- Service was later restored but continued to run with severe delays between Paddington and Heathrow/Reading as crews staged a phased recovery of trains.
- A separate signal failure at Boston Manor in the early afternoon partially suspended the Piccadilly line between Acton Town and Heathrow and required alternative ticketing on other services.
- The overruns also disrupted Great Western Railway and Heathrow Express services and coincided with other faults — cancellations between West Ealing and Greenford and a speed restriction between Welwyn Garden City and Potters Bar that cut Great Northern and Thameslink capacity.
- TfL, National Rail and operators accepted tickets via reasonable alternative routes and advised passengers to expect ongoing disruption, underscoring how late-night maintenance and isolated signalling faults can cascade into major peak‑hour travel and airport-connection problems.