On Saturday, July 19, and Sunday, July 20, Southern and London Overground services will be severely affected.
Southern trains between East Croydon, Clapham Junction, and Watford Junction will not run from 8pm on Saturday and all day on Sunday.
London Overground trains will also not run between Clapham Junction and Willesden Junction or Stratford on Sunday.
Southern passengers can use London Overground trains at no extra cost between Clapham Junction and Willesden Junction on Saturday evening.
On Sunday, passengers can use Southern trains between Clapham Junction and London Victoria and London Underground services between London Victoria and London Euston.
London Northwestern Railway or London Overground trains can also be used between London Euston and Watford Junction.
Southern services between London Victoria and Sutton, Epsom Downs, Three Bridges, Brighton, Tulse Hill, and Tattenham Corner will also be affected due to engineering work between Balham and East Croydon.
Services will be amended late at night and early in the morning on Saturday and Sunday.
Replacement buses will run between Clapham Junction and Selhurst and from Selhurst to East Croydon on Saturday night.
Journey times will be extended on Sunday morning.
Southern services between London Victoria and Littlehampton, Bognor Regis, and Chichester will also be affected by engineering work between Littlehampton and Bognor Regis or Chichester on Saturday and Sunday.
The 10.16pm London Victoria to Bognor Regis train will be diverted to Chichester and not call at Bognor Regis.
The 10.35pm London Victoria to Chichester train will be diverted to Bognor Regis and not call at Chichester.
Until approximately 9.15am on Sunday morning, buses will replace trains between Littlehampton and Bognor Regis or Chichester and between Havant and Southampton Central.
Southern services between London Bridge and Norwood Junction, Selhurst, London Victoria, Beckenham Junction, East Croydon, and Caterham will also be affected by engineering work between London Bridge and Tulse Hill or New Cross Gate.
All day on Saturday and Sunday, buses will replace trains between London Bridge and Tulse Hill via Peckham Rye, also calling additionally at Herne Hill.
On Saturday, trains which usually run between London Bridge and Beckenham Junction will only run between Tulse Hill and Beckenham Junction.
Trains which usually run between London Bridge and East Croydon via Peckham Rye will only run between Tulse Hill and East Croydon.
On Sunday, trains which usually run between London Bridge and East Croydon via Peckham Rye will only run between Tulse Hill and Caterham or Tattenham Corner via East Croydon, running via Norwood Junction until approximately 9am.
Until approximately 9am on Sunday morning, buses will replace trains additionally between Tulse Hill and East Croydon.
Trains which usually run between London Victoria and London Bridge will only run between London Victoria and Crystal Palace.
Trains which usually run between London Bridge and Caterham via Norwood Junction will not run.
Finally, South Western Railway and Southern services between London Waterloo or London Victoria and Effingham Junction or Dorking will also be affected by engineering work between Motspur Park and Effingham Junction or Dorking.
Buses will replace trains between Tolworth and Effingham Junction or Dorking on Sunday.
