Trains running in and out of London Paddington have been disrupted this afternoon by a problem with line-side equipment between the station and Ealing Broadway.
Passengers have been experiencing delays of up to 15 minutes.
London-bound lines have re-opened and it is hoped a normal service will resume soon.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.