Almost a year after being postponed, London mayor Boris Johnson has confirmed the Night Tube service will begin in July.
Mr Johnson made the declaration as he sampled one of the train simulators that will be used by the 200 part-time drivers who will help run the service.
A Tfl spokesman said: “We are not in a position to fix an exact date but we are working to a time in late July at the earliest, to start the Night Tube service.”
The breakthrough, after months of negotiations, comes after the two biggest Tube unions (Aslef and the Rail, Maritime and Transport) agreed a pay deal.
Finn Brennan, the District Organiser for Aslef, claimed his union were “always in favour of the Night Tube.”
He added: “A world-class capital city such as London deserves a world-class public transport system. We are really pleased that passengers will be able to enjoy an all-night service from July, operated under agreements that have improved conditions for existing drivers and created hundreds of new jobs, and new Aslef members.”
The Night Tube will provide around the clock service on the Victoria, Jubilee, Central, Northern and Piccadilly lines on Fridays and Saturdays.