Rush hour commuters could face delays on services to and from London Paddington due to signalling problems.
Trains will be delayed by up to 20 minutes due to problems between Paddington and Ealing Broadway.
There is no current estimate when normal service will resume.
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The victim of an assault in Cippenham was flown to hospital by air ambulance this afternoon.
A rapid response vehicle, an ambulance officer, an air ambulance and an ambulance crew were all called to an address in Earls Lane at 2.10pm.