Rail services between Maidenhead and Marlow have been cancelled after a person was hit by a train at about 1.30pm.
The line which runs through Bourne End, Cookham and Furze Platt has been closed.
A bus replacement service is running with journey times being extended by up to 25 minutes.
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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.