Passengers are facing disruption on rail services.
Trains to and from Heathrow Airport are affected due to a communication alarm being activated on a train at the airport, National Rail has confirmed.
The incident is affecting both the Elizabeth line and Heathrow Express services.
A spokesperson said: “The communication alarm being activated on a train at Heathrow Airport means that some lines are blocked.
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“As a result, trains running to / from Heathrow Airport may be cancelled, delayed by up to 30 minutes or revised.”
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Disruption is expected until 11am.
Passengers are advised to check their journey before travelling, with real-time updates available via the National Rail Journey Planner.
Commuters experiencing delays may be entitled to compensation and travellers are advised to retain their tickets and make a note of their journey to support any claims.
