There is an emergency road closure on the A285 High Street Duncton between south of the entrance to Seaford College and the junction of Beechwood Lane following a slippage of earth over a culvert that spans beneath the carriageway.
Businesses remain open and signs in place to aid with the diversion.
No trains will run between London Victoria and East Croydon while Network Rail South East carry out works this weekend, Southern Rail said.
From today all Southeastern services will be operated by SE Trains Ltd, a subsidiary of the Government’s operator, DOHL, a company spokesman said.
He added: “We will continue to be known as Southeastern across our stations and trains.
“There will be no changes in our day-to-day services, our timetables, or our customer services, as a result of the transfer.
“Southeastern remain proud to serve passengers and communities across London, Kent and East Sussex and is committed to providing accessible and comfortable journeys for all.
“Our work continues on enhancing customer experience with the launch of new products and tools designed to help improve your journey.”