A burst water main near Heathrow Airport on Saturday morning caused a fault in the signalling system, shutting down the Heathrow Express and Elizabeth Line for most of the day and cuutting the Piccadilly Line from the airport. transport for London and National Rail have since reopened the affected services, though the Piccadilly Line remains closed to Heathrow terminals due to planned engineering works, with replacement buses running in the interim.

Heathrow Express and Elizabeth Line Shut Down for Hours After Water Main Burst

According to the report, the burst water main created a signalling fault that forced the Heathrow Express and Elizabeth Line to suspend service for much of the morning. The Heathrow Express, which runs 150 trains a day between Paddington and Heathrow, saw cancellations and delays of up to 15 minutes. The Elizabeth Line, meanwhile, resumed service later in the day but still faced disruptions.

Piccadilly Line Cut Off from Heathrow Amid Planned Engineering Works

The Piccadilly Line was not only affected by the signalling fault but also by scheduled engineering works, leaving no service between Acton Town and all Heathrow terminals. Transport for London confirmed that rail replacement buses are operating for these routes while the line remains closed.

National Rail and TfL Apologise for Major Disruption

National Rail issued an apology after the burst water main caused the signalling problems, and Transport for London has also expressed regret for the inconvenience. The Heathrow airport’s X account posted a statement at 12:20pm noting that services were beginning to resume on the Elizabeth Line and Heathrow Express, urging passengers to allow extra travel time .

Unanswered Question: Who Will Repair the Water Main?

The source does not identify the contractor or timeline for repairing the burst water main that triggered the signalling failure. passengers and operators are left wondering how long the infrastructure repairs will take and whether additional disruptions are likely.