Replacement buses continue to be in place along the coastal line because of major engineering works all weekend.
Services to and from London are being disrupted by the work between Balham and Selhurst which means many journeys will be diverted to and from London Blackfriars and London Bridge.
Southern tickets will be accepted on tube services between London Bridge, London Blackfriars and London Victoria, the company said.
Rail users are advised to check journey times before setting off.
The major roads currently look clear across most of East and West Sussex this morning.
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