Passengers travelling between London Victoria and Orpington will have to use a bus replacement service due engineering works taking place between Brixton and Beckenham Junction.
Buses will replace trains between Denmark Hill and Bromley South - via Herne Hill, all day.
And, London Victoria to Orpington services will be re-timed and diverted to run via Denmark Hill.
Services that run between London Victoria and Canterbury East via Sole Street will be re-timed to stations between Bromley South and Canterbury East.
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