Lines have now reopened.
Rail lines heading to and from London Paddington are blocked after a person was hit by a train between Ealing Broadway and Southall.
Operator Great Western Railway said services running through the stations will be cancelled or delayed.
Disruption is expected to continue until at least 2pm.
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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.