A strip of the London Overground network will run 24 hours on Fridays and Saturdays, from December 2017.
The all-night service will operate between New Cross Gate and Dalston Junction. It will then be extended northward to reach Highbury and Islington some time in 2018.
The Mayor of London, Sadiq Khan, said:
Our night tube services have been a real success right across the capital, so I’m delighted to announce that we’ll be bringing the Night Overground to the East London line later this year. It will provide huge benefits to Londoners and visitors to our city, helping those working hard through the night and all those out enjoying everything London has to offer, as well as creating jobs and boosting our economy.
Due to Crossrail work taking place at Whitechapel station, London Overground night services will initially not call at the station until works are complete. Services are expected to call at the station from summer 2018.
More than 6.5m journeys have been made on the night tube, since it began last year. The new Night Overground service will connect with the night tube at two points: the Jubilee line at Canada Water, and — when it extends to Highbury & Islington — the Victoria line.
This year marks the 10th anniversary of the London Overground.