- Burst water main/flooding at Heathrow terminals 2–3 caused a signal failure that halted trains (Heathrow Express, Elizabeth line) for hours; Piccadilly line was also disrupted by planned engineering work.
- Passengers faced long queues, buses, confusion and emotional scenes — many venting frustration on social media.
- All lines have now reopened and both Heathrow and National Rail issued apologies for the disruption.
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