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Commuters are facing delays between Ashford and Tonbridge because of a single fault on the line.
Southern Rail announced earlier today there is major disruption on the line because of the fault.
People travelling between Tonbridge and Redhill will also face delays until at least 4pm today after the fault was found on the line between East Croydon and Gatwick Airport.
A tweet earlier today said services including the Gatwick Express, Southern and Thameslink services may be cancelled or delayed by up to 60 minutes.
Replacement bus services are being arranged between Oxted and Uckfield to take passengers to Tunbridge Wells, where commuters will be able to travel on Southeastern services to London Charing Cross.