Flooding on the tracks between Redhill and Bognor are delaying trains by up to 90 minutes.
Flooding between Christs Hospital and Three Bridges is causing delays of up to 90 minutes between these stations.
Network Rail said there is no current estimate for when a normal service will resume.
Trains are being diverted via Brighton.
Trains between London Charing Cross and Hastings have been delayed by flooding at Wadhurst.
For more information visit www.networkrail.co.uk.
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