London's Night Tube service will launch on 19 August, mayor Sadiq Khan has announced.
A 24-hour service will start first on the Central and Victoria lines, with the Piccadilly, Jubilee and Northern following in the autumn.
The launch should reduce average night-time journeys by 20 minutes, according to Transport for London.
Central Line trains will run between Ealing Broadway and Loughton/Hainault, with the Victoria line's 24-hour service running on the entire line. The Northern Line service will run on the entire line except the Mill Hill East and Bank Branches, Piccadilly line trains will run between Cockfosters and Heathrow Terminal 5 and Jubilee line trains will run on the entire line.
To meet customer demand, Transport for London will run six trains per hour through central London on all Night Tube lines between 0030 and 0530. Eight trains per hour will run on the Northern line between Leicester Square and Camden Town.
The RMT union is still in dispute over the running of the Night Tube, with general secretary Mick Cash saying there were "major unresolved issues" relating to the Tube's engineering workforce.
The union agreed a deal for its drivers in March, but has been able to reach agreement on a package for maintenance staff.
"It is imperative that the company now moves quickly to address the points at the core of that dispute and reaches a proper negotiated settlement with the union that doesn't leave that essential group of workers disadvantaged on conditions and pensions," he said in a statement.
The mayor's office said around 200 part-time drivers were now taking part in a 14-week training scheme to run the Night Tube.
It is hoped the weekend service will boost London's economy by £360 million, with people no longer reliant on night buses and taxis to get home late in the evening.
This article was originally published by WIRED UK
