The work will affect trains in the Sutton and Croydon area from Tuesday (April 22) to Thursday (April 24).
Services will not be affected on Friday (April 25).
We have outlined and simplified the details so you can plan your journey this week.
Tuesday to Thursday (April 22 to April 24):
Engineering work is taking place between Purley and Caterham and Tattenham Corner, closing some lines each night.
From approximately 10.45pm until the end of service on Tuesday to Thursday evenings, replacement buses will run between East Croydon, Purley, Caterham, and Tattenham Corner.
Journey times may be increased when using replacement buses.
Engineering work is also taking place between Norwood Junction and Epsom Downs, closing some lines.
At the end of service from Monday to Thursday evenings, replacement buses will run between Norwood Junction and Selhurst, and between Norwood Junction and West Croydon, Sutton, Epsom Downs.
