Tube service in London are being significantly disrupted (delays and cancelations) as of the morning (local time) of Thursday, April 18, due to multiple signal system faults on the Circle, Hammersmith and City, District, and Metropolitan lines. Trains to Heathrow Airport (LHR) are also affected. Replacement buses have been put in place. It is unclear when normal services will resume; lingering disruptions are likely in the coming hours.
Individuals in London or traveling to LHR are advised to monitor the situation, maintain flexible itineraries, and anticipate transportation disruptions.
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