London night tube map: What is it and what lines stay open?
LONDON's 24-hour transport network is back on the Central and Victoria lines.
Here's all you need to know about the night tube.
What is the night tube?
The night tube is the metro in London that runs throughout the night on certain days and lines.
Former Mayor Boris Johnson's brain child was held back by a year as the Rail, Maritime and Transport Union (RMT) clashed with TfL over pay and conditions.
But the project took off in 2016 and after a staggered start all five proposed lines are running all-night services for Londoners on the weekends with the London Overground now set to join them.
Which lines stay open?
The first lines to take on the 24-hour service were the Central and Victoria lines on August 19, 2016.
Central line services run between Ealing Broadway and Loughton/Hainault while the entire Victoria line stays open.
Services were then launched on the Northern line and the Piccadilly line joined the network in.
And in July, 2017, it was announced the London Overground, also referred to as the Orange Line, will operate all night on Friday and Saturdays between New Cross Gate and Dalston Junction - with the service to then be extended to Highbury & Islington in 2018.
The Northern line ran a 24-hour from Morden via Camden Town and on to Edgeware/High Barnet with no service on the Bank or Mill Hill East branches.
Piccadilly line ran between Cockfosters and Heathrow Terminal 5 with no services on the Terminal 4 loop or between Uxbridge and Acton Town.
TfL said they "plan to expand the night time service to parts of the Metropolitan, Circle, District, and Hammersmith & City lines once our modernisation programmes are complete”.
Since the pandemic when the Night Tube stopped, only the Central and Victoria have been announced to make a come back. The Jubilee, Piccadilly, Northern and Overground lines have not returned yet.
What lines are on the Night Tube and how regular are the trains?
Victoria line - trains run on average every 10 minutes across the entire line
Central line - trains run approximately every 10 minutes between White City and Leytonstone and approximately every 20 minutes between Ealing Broadway to White City and Leytonstone to Loughton/ Hainault. No service between North Acton and West Ruislip, Loughton and Epping and Woodford and Hainault
Jubilee line - trains run on average every 10 minutes across the entire line
Northern line - trains run on average every 8 minutes between Morden and Camden Town and approximately every 15 minutes from Camden Town to High Barnet / Edgware. Night Tube services will not stop at Charing Cross until July 2017. No service on the Mill Hill East and Bank branches
Piccadilly line - trains run on average every 10 minutes between Cockfosters and Heathrow Terminal 5. No service on the Terminal 4 loop, or between Acton Town and Uxbridge
London Overground - trains will run between New Cross Gate and Dalston Junction, before being extended to Highbury & Islington in 2018
How regular are the trains?
Victoria line services run every 10 minutes between all stations.
Central line trains also run at 10 minute intervals between White City and Leytonstone, and every 20 minutes between White City and Ealing Broadway and the same between Leytonstone and Loughton/Hainault.
No night tube services run between Loughton and Epping, Woodford and Hainault or North Acton and West Ruislip.
Jubilee services run at 10 minute intervals calling at all stations.
Piccadilly line trains between Cockfosters and Heathrow Terminal 5 are also expected to run every 10 minutes.
Northern line services run at eight minute intervals between Morden and Camden Town and every 15 minutes on from there to High Barnet/Edgware.
How much does it cost?
Normal off-peak fairs apply across the service with day travelcards valid until 4.29am the day after purchase.
There is also staff on hand at all stations while the service is in operation to assist passengers.
Additionally TfL has said there is "an enhanced policing presence during the overnight services", as more than 100 cops have been deployed to patrol the 144 stations that will stay open through the night each weekend.
City Hall believes the Night Tube provides a boost of over £70million a year to London's economy, as well as supporting approximately 2,000 jobs.
Mayor of London Sadiq Khan told : "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.