There is disruption on South West Trains between Guildford and London Waterloo because of a fallen tree on the line at Effingham Junction.
All the lines are blocked at present and there is no estimate time for normal service.
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Train services through Gatwick Airport face delays and disruption after a track fire closed half of the lines at the station.
Network Rail has reopened two of the four lines but two will remain closed for the rest of the day.
Tuesday afternoon's weather for the west of the region