Passengers are being urged to check before they travel during the Christmas period as Network Rail’s engineering upgrades will cause changes to services.
From December 23 to New Year’s Day, the line between Herne Hill, Brixton and London Victoria will be closed while Network Rail engineers upgrade the railway.
It will also be closed over the weekends of January 6 to 7 and 13 to 14.
Southeastern services will be diverted into either Blackfriars, Cannon Street or Charing Cross, and buses will replace London Overground trains between Surrey Quays and Clapham Junction.
Engineers will work around the clock to make track upgrades and signaling improvements.
Upgrades to the 1980s signaling system between Herne Hill and Nunhead into London Victoria station will also continue, ready to be used around late December 2024.
Ellie Burrows, Network Rail’s Southern regional managing director, said: “We know that there is never a good time to close the railway, but passenger numbers are a lot lower at this time of year which is why we try to pack as much work in as possible and reduce disruption.
“There will be varying changes to train services during this time, so we are advising passengers to plan ahead and check the latest travel information with their train operator or National Rail.”
