Trains in south London will be heavily disrupted with little to no service for nine days, passengers have been warned.
Network Rail urged south London railway passengers to plan ahead during upgrade works from August 24 to September 1 in the Crystal Palace area.
Engineers will be carrying out a "major track upgrade", replacing 1,500m of track, five sets of switches and crossings and moveable rails.
It means no Southern Railway trains will run at West Norwood, Gipsy Hill, Birkbeck and Beckenham Junction stations during the works.
No trains will run to or from Crystal Palace from August 24 to 26.
Also affected are trains at stations from Streatham Hill to Norwood Junction and Sydenham, with a reduced Southern service through Peckham Rye, East Dulwich, North Dulwich, Tulse Hill, Norwood Junction and West Croydon stations, National Rail said.
Passengers will be able to use their tickets on London Underground, London Overground and London Buses.
King’s College Hospital warned its patients of possible disruption to public transport during the works, writing: “We would urge all patients and visitors to our hospitals to plan your journey in advance, and to use alternative methods of transport.”
Lucy McAuliffe, Network Rail’s Sussex route director, said the work would "help reduce train delays and improve passenger journeys".
“We're advising people to plan ahead and use London Buses, London Underground or alternative National Rail services," she said.
"Please check before you travel and thanks for bearing with us while this essential work is carried out."
