From Saturday 26 October to Friday 1 November (half-term week) work on upgrading signalling systems will impact routes right across south London. Southern, Thameslink, and London Overground trains will not run in the Peckham Rye, Tulse Hill, Crystal Palace and Tooting areas because of signalling upgrades. The upgrades aim to improve reliability on the network, helping even more passenger and freight trains arrive at their destinations on time.

Here is a breakdown of the closures, effecting lots of different stations, including West Norwood, Tulse Hill, Crystal Palace and Herne Hill.

Southern services

• From Monday 28 October to Friday 1 November there will be no Southern trains beyond Streatham Hill towards London Bridge via Crystal Palace or West Croydon via Crystal Palace.
• At Birkbeck, East Dulwich, Gipsy Hill, North Dulwich, Queens Road Peckham, South Bermondsey, Tulse Hill and West Norwood stations, there will be no Southern trains from Saturday 26 October to Friday 1 November.
• For Brockley, Forest Hill, Honour Oak Park, New Cross Gate and Sydenham stations, from Saturday 26 October to Friday 1 November there won't be any Southern trains to London Victoria via Crystal Palace and Streatham Hill.
• Crystal Palace: no Southern trains from Saturday 26 October to Friday 1 November.
• London Bridge and Peckham Rye: no Southern trains to Streatham or Beckenham Junction via Tulse Hill or to London Victoria via Crystal Palace and Streatham Hill, from Saturday 26 October to Friday 1 November.
• Norwood Junction and West Croydon: no Southern trains from Saturday 26 October to Friday 1 November, to London Victoria via Crystal Palace and Streatham Hill.
• Streatham Hill: Monday 28 October to Friday 1 November, no Southern trains towards London Bridge via Crystal Palace or to West Croydon via Crystal Palace.

Overground services

• Brockley, Forest Hill, Honor Oak Park, New Cross Gate and Sydenham stations: reduced Overground services from Saturday 26 to Tuesday 29 October, and no Overground services to Crystal Palace.
• Clapham High Street, Denmark Hill and Wandsworth Road: no Overground trains from Saturday 26 October to Friday 1 November.
• Crystal Palace: no Overground trains Saturday 26 October to Tuesday 29 October.
• Clapham Junction, no Overground trains from Saturday 26 October to Friday 1 November between Clapham Junction and Surrey Quays.

Thameslink services

• Carshalton, Hackbridge, Mitcham Eastfields, Mitcham Junction, Sutton and Wimbledon: no Thameslink trains from Saturday 26 October to Friday 1 November.
• No Thameslink trains between Herne Hill and Wimbledon / Sutton from Saturday 26 October to Friday 1 November, impacting City Thameslink, Elephant & Castle, Farringdon, Herne Hill, London Blackfriars, Loughborough Junction and St Pancras International.
• Streatham: Saturday 26 October and to Friday 1 November, no Thameslink trains between Herne Hill and Wimbledon / Sutton and no Southern trains to London Bridge via Tulse Hill and Peckham Rye.

Station closures

• East Croydon, Norbury, Selhurst, Streatham Common and Thornton Heath: no trains to London Bridge via Tulse Hill and Peckham Rye from Saturday 26 October to Friday 1 November.
• Streatham Hill: Saturday 26 - Sunday 27 October, no trains.

Replacement buses

• Replacement buses will run between London Bridge and Streatham Common via Peckham Rye and Tulse Hill.
• Journey times will be increased on replacement buses.
• No replacement buses will run between Balham and Norwood Junction, West Croydon / Beckenham Junction via Crystal Palace.

You can check for further info on Southern here, Thameslink here and TfL here.