Heathrow rail disruption: 20-minute delays until 2pm after signalling fault
National Rail accepts tickets on alternative routes as Elizabeth line and Heathrow Express services recover
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Passengers travelling to Heathrow Airport faced disruption on 12 August 2026 after a signalling fault affected rail services between London Paddington, Heathrow and Reading. National Rail said the lines had reopened but warned that delays of up to 20 minutes and last-minute cancellations would persist until 14:00.
The fault disrupted services on the Elizabeth line, Great Western Railway and Heathrow Express. Elizabeth line trains between Abbey Wood and Heathrow Terminal 4, and between Shenfield and Heathrow Terminal 5, were among those affected. Great Western Railway services from London Paddington and Heathrow Express trains to Terminal 5 also experienced delays.
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Alternative routes and ticket acceptance
National Rail arranged for tickets to be accepted on alternative routes to help passengers reach Heathrow. Travellers could use South Western Railway, London Underground, Chiltern Railways, Heathrow Express and certain London bus services without paying additional fares. The measure was intended to reduce pressure on affected routes during the recovery period.
Zubair Rasool, senior director at United Minibuses and Coaches, told passengers not to assume services had returned to normal. He said, as reported by *This Is Local London*, that summer holiday travel added stress to airport journeys, where even short delays could cause missed flights. Rasool recommended checking updates before leaving and having a backup plan in place.
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For anyone heading to Heathrow today, the important thing is not to assume that because the lines have reopened everything is immediately back to normal.
Zubair Rasool, senior director at United Minibuses and Coaches
Rasool added that passengers should continue monitoring the situation even if their journey appeared unaffected. He said, as reported by *This Is Local London*, that airport trips carried higher stakes than everyday travel, where a 20 or 30-minute delay could have serious consequences. He advised choosing routes with enough contingency to reach the terminal comfortably.
What happens next
National Rail has not stated when normal service will fully resume. Passengers are advised to check real-time updates with National Rail or their train operator before travelling. The disruption coincides with the summer holiday period, when airports typically experience higher passenger volumes.
Questions this report answers
+Which rail services were affected by the signalling fault?
The Elizabeth line, Great Western Railway and Heathrow Express services between London Paddington, Heathrow and Reading were disrupted on 12 August 2026. Delays of up to 20 minutes and cancellations were expected until 14:00, as reported by National Rail.
+Can I use my ticket on other routes to get to Heathrow?
Yes. National Rail arranged for tickets to be accepted on alternative routes, including South Western Railway, London Underground, Chiltern Railways, Heathrow Express and certain London bus services, at no extra cost during the disruption.
+How long will the delays last?
National Rail said delays of up to 20 minutes and short-notice cancellations were expected to continue until 14:00 on 12 August 2026. Passengers were advised to check for updates before travelling.
+What should I do if my train is cancelled?
Zubair Rasool, senior director at United Minibuses and Coaches, advised passengers to have a backup plan and check for alternative routes before leaving. Tickets were accepted on other services, so travellers could switch without paying extra.
WE FILE
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The London Travel Desk assembled this report from the outlets listed below. Language-model drafting is reviewed under human editorial supervision, with scoring notes and corrections kept visible.
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