This is due to engineering work, and it will affect trains on Saturday and Sunday (September 20 to September 21).
We have outlined all the details for you to plan your journey this weekend.
On Saturday and Sunday, no Southern services will run to and from London Victoria.
Saturday (September 20):
Replacement buses will run between Clapham Junction and Balham, calling at Wandsworth Common.
Trains will run to an amended timetable between Balham and West Croydon via Crystal Palace and Norwood Junction, and between Balham and Epsom Downs via Selhurst and West Croydon.
Trains to and from Uckfield will only run between East Croydon and Uckfield.
No trains will run between London Bridge and Beckenham Junction.
Sunday (September 21):
Replacement buses will run between Clapham Junction and Streatham Common, calling at Wandsworth Common and Balham.
Trains will run to an amended timetable between Streatham Hill and West Croydon via Crystal Palace and Norwood Junction, and between Selhurst and Epsom Downs via West Croydon.
Saturday and Sunday (September 20 and September 21):
Trains between London Bridge and London Victoria via Sydenham and Crystal Palace will not run.
No direct services will operate between London and Reigate.
Trains will be amended to run between Reigate and Redhill only.
Passengers should use alternative trains between Redhill and London.
No Southern trains will call at stations between London Bridge and East Croydon via Sydenham.
No trains will run between East Croydon, Clapham Junction and Watford Junction.