Talks over an all night Tube in London have broken up without agreement and the new service will not come in this year, union sources told the Press Association.
In August London Underground announced the service would be postponed.
The all-night tube service, set to run on selected Friday and Saturday evenings, was due to start on 12 September.
Londoners are still going to have to run for the last train
No new commencement date was given.
In a statement on Wednesday, Finn Brennan from the train drivers' union, Aslef, said: "We have made it clear to London Underground that we want to keep talking and develop a solution that delivers night Tube while protecting and improving work life balance for our members.
"We have put forward a number of proposals to resolve this dispute in a way that is fair and benefits both sides.
"London Underground have rejected them all. Most disappointingly of all they have decided to blackmail their own employees by refusing to make a pay offer unless staff agree to worsen their working conditions.
"That is not something we are prepared to accept. Underground management have completely mishandled these negotiations. They have wasted every opportunity for a settlement and seem to have been determined to provoke confrontation rather than resolution."
In August LU's managing director Nick Brown said the organisation was close to reaching an agreement on pay and conditions.
He said: "Further to the progress made in recent days with the trade unions and the suspension of strike action, we believe we are not far from an agreement that protects the work-life balance of our employees and is affordable, sustainable and fair.
"As such, we have decided to defer the introduction of Night Tube to allow more time for those talks to conclude. Our objective is to reach an agreement that ends this dispute and delivers the Night Tube for Londoners this Autumn.”
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London Tube Strike
Tube strike(01 of50)
A passer-by reacts after being offered a leaflet by a member of the tssa union outside King's Cross station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Yui Mok/PA Wire)
Tube strike(02 of50)
A passer-by takes a leaflet from a member of the tssa union outside King's Cross station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Yui Mok/PA Wire)
Britain Tube Strike(03 of50)
People queue for buses in London, Thursday, Aug. 6, 2015. Commuters are facing a day of disruption after a strike shut down the London Underground system for a second time this summer. Unions walked off the job amid a dispute about how to implement a new 24-hour service on weekends. Unions argue work-life balance issues haven't been addressed and that management should hire more people to cover extra shifts. (AP Photo/Frank Augstein) (credit:Frank Augstein/AP)
Britain Tube Strike(04 of50)
Buses queue in London, Thursday, Aug. 6, 2015. Commuters are facing a day of disruption after a strike shut down the London Underground system for a second time this summer. Unions walked off the job amid a dispute about how to implement a new 24-hour service on weekends. Unions argue work-life balance issues haven't been addressed and that management should hire more people to cover extra shifts. (AP Photo/Frank Augstein) (credit:Frank Augstein/AP)
Britain Tube Strike(05 of50)
Workers refill bicycle hire racks in London, Thursday, Aug. 6, 2015. Commuters are facing a day of disruption after a strike shut down the London Underground system for a second time this summer. Unions walked off the job amid a dispute about how to implement a new 24-hour service on weekends. Unions argue work-life balance issues haven't been addressed and that management should hire more people to cover extra shifts. (AP Photo/Ashley Chan) (credit:Ashley Chan/AP)
Britain Tube Strike(06 of50)
People cycle, run or walk across London Bridge in central London, Thursday, Aug. 6, 2015. Commuters are facing a day of disruption after a strike shut down the London Underground system for a second time this summer. Unions walked off the job amid a dispute about how to implement a new 24-hour service on weekends. Unions argue work-life balance issues haven't been addressed and that management should hire more people to cover extra shifts. (AP Photo/Tony Hicks) (credit:Tony Hicks/AP)
BRITAIN-TRANSPORT-STRIKE(07 of50)
Commuters queue for buses as a 24 hour tube strike hits the morning rush hour at Victoria station, central London on August 6, 2015. The strike began at 6:30 pm (1730 GMT) on August 5 and will run until Friday morning, causing disruption for millions of commuters and tourists.AFP PHOTO/Leon Neal (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
BRITAIN-TRANSPORT-STRIKE(08 of50)
Commuters queue for buses as a 24 hour tube strike hits the morning rush hour at Victoria station, central London on August 6, 2015. The strike began at 6:30 pm (1730 GMT) on August 5 and will run until Friday morning, causing disruption for millions of commuters and tourists.AFP PHOTO/Leon Neal (Photo credit should read LEON NEAL,LEON NEAL/AFP/Getty Images) (credit:AFP via Getty Images)
BRITAIN-TRANSPORT-STRIKE(09 of50)
Two skaters take part in a promotional event by Penny Skateboards, giving free boards to stranded commuters as a 24 hour tube strike hits the morning rush hour at Victoria station, central London on August 6, 2015. The strike began at 6:30 pm (1730 GMT) on August 5 and will run until Friday morning, causing disruption for millions of commuters and tourists.AFP PHOTO/Leon Neal (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
BRITAIN-TRANSPORT-STRIKE(10 of50)
Commuters cross the river Thames on the Millennium footbridge as a tube strike hits the morning rush hour in the city of London on August 6, 2015. Millions of Londoners were forced to walk, cycle or take packed buses to work today as Underground staff staged a second strike in a month over plans to run trains all night at weekends. London Underground staff walked out yesterday evening and will not return until the morning of August 7, causing a shutdown of all 11 lines on the subway network and severely disrupting the capital. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL,BEN STANSALL/AFP/Getty Images) (credit:AFP via Getty Images)
BRITAIN-TRANSPORT-STRIKE(11 of50)
Commuters cross the river Thames on the Millennium footbridge as a tube strike hits the morning rush hour in the city of London on August 6, 2015. Millions of Londoners were forced to walk, cycle or take packed buses to work today as Underground staff staged a second strike in a month over plans to run trains all night at weekends. London Underground staff walked out yesterday evening and will not return until the morning of August 7, causing a shutdown of all 11 lines on the subway network and severely disrupting the capital. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL,BEN STANSALL/AFP/Getty Images) (credit:AFP via Getty Images)
BRITAIN-TRANSPORT-STRIKE(12 of50)
London Underground Piccadilly Line tube trains are parked at the Northfields Depot in west London on August 6, 2015 during a 24-hour strike of Underground staff. Millions of Londoners were forced to walk, cycle or take packed buses to work as Underground staff staged a second strike in a month over plans to run trains all night at weekends. London Underground staff walked out on August 5 evening and will not return until the morning of August 7, causing a shutdown of all 11 lines on the subway network and severely disrupting the capital. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
BRITAIN-TRANSPORT-STRIKE(13 of50)
London Underground Piccadilly Line tube trains are parked at the Northfields Depot in west London on August 6, 2015 during a 24-hour strike of Underground staff. Millions of Londoners were forced to walk, cycle or take packed buses to work as Underground staff staged a second strike in a month over plans to run trains all night at weekends. London Underground staff walked out on August 5 evening and will not return until the morning of August 7, causing a shutdown of all 11 lines on the subway network and severely disrupting the capital. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images) (credit:LEON NEAL via Getty Images)
Britain Tube Strike(14 of50)
Commuters are reflected in a bus window as they queue for a bus in London, Thursday, Aug. 6, 2015. Commuters are facing a day of disruption after a strike shut down the London Underground system for a second time this summer. Unions walked off the job amid a dispute about how to implement a new 24-hour service on weekends. Unions argue work-life balance issues haven't been addressed and that management should hire more people to cover extra shifts. (AP Photo/Frank Augstein) (credit:ASSOCIATED PRESS)
Britain Tube Strike(15 of50)
Police officers stand guard at a bus stop outside Paddington Station in London, Thursday, Aug. 6, 2015. Commuters are facing a day of disruption after a strike shut down the London Underground system for a second time this summer. Unions walked off the job amid a dispute about how to implement a new 24-hour service on weekends. Unions argue work-life balance issues haven't been addressed and that management should hire more people to cover extra shifts. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
Britain Tube Strike(16 of50)
Ticket entrance machines are seen behind metal gates at the closed entrance to Marylebone tube station in London, Thursday, Aug. 6, 2015. Commuters are facing a day of disruption after a strike shut down the London Underground system for a second time this summer. Unions walked off the job amid a dispute about how to implement a new 24-hour service on weekends. Unions argue work-life balance issues haven't been addressed and that management should hire more people to cover extra shifts. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
Britain Tube Strike(17 of50)
Thousands of bicycles are locked in a bike rack at Paddington Station in London, Thursday, Aug. 6, 2015. Commuters are facing a day of disruption after a strike shut down the London Underground system for a second time this summer. Unions walked off the job amid a dispute about how to implement a new 24-hour service on weekends. Unions argue work-life balance issues haven't been addressed and that management should hire more people to cover extra shifts. (AP Photo/Kirsty Wigglesworth) (credit:ASSOCIATED PRESS)
Britain Tube Strike(18 of50)
Passengers crowd around a bus stop outside Paddington Station in London, Thursday, Aug. 6, 2015. Commuters are having to find alternative methods of travel Thursday as the London tubes are not running due to a strike. London's mayor has ruled out offering more money to resolve a London Underground labor set to shut down services for the second time this summer. (AP Photo/Kirsty Wigglesworth) (credit:Kirsty Wigglesworth/AP)
Britain Tube Strike(19 of50)
Passengers crowd around a bus stop outside Paddington Station in London, Thursday, Aug. 6, 2015. Commuters are having to find alternative methods of travel Thursday as the London tubes are not running due to a strike. London's mayor has ruled out offering more money to resolve a London Underground labor set to shut down services for the second time this summer. (AP Photo/Kirsty Wigglesworth) (credit:Kirsty Wigglesworth/AP)
Tube strike(20 of50)
People wait for buses close to Brixton Underground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Anthony Devlin/PA Wire)
Tube strike(21 of50)
Police watch as people queue for a bus near Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(22 of50)
RMT members hold a picket outside Brixton Underground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Anthony Devlin/PA Wire)
Tube strike(23 of50)
RMT members hold a picket outside Brixton Underground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Anthony Devlin/PA Wire)
Tube strike(24 of50)
RMT members hold a picket outside Brixton Underground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Anthony Devlin/PA Wire)
Tube strike(25 of50)
RETRANSMISSION WITH IMPROVED QUALITY People stand on a cramped bus from Finsbury Park station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Becky Barnes/PA Wire)
Tube strike(26 of50)
RETRANSMISSION WITH IMPROVED QUALITY People stand on a cramped bus from Finsbury Park station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Becky Barnes/PA Wire)
Tube strike(27 of50)
People queue for buses near Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(28 of50)
Police wait by a bus stop as people queue for a bus near Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(29 of50)
Police watch as people queue for a bus near Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(30 of50)
RMT members hold a picket outside Brixton Underground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Anthony Devlin/PA Wire)
Tube strike(31 of50)
RMT members hold a picket outside Brixton Underground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Anthony Devlin/PA Wire)
Tube strike(32 of50)
A commuter asks for directions outside a closed Brixton Underground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Anthony Devlin/PA Wire)
Tube strike(33 of50)
People queue for buses near Liverpool Street station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Kate Ferguson/PA Wire)
Tube strike(34 of50)
Commuters wait to board a train to Kings Cross at Finsbury Park overground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Yui Mok/PA Wire)
Tube strike(35 of50)
Commuters wait to board a train to Kings Cross at Finsbury Park overground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Yui Mok/PA Wire)
Tube strike(36 of50)
Commuters wait to board a train to Kings Cross at Finsbury Park overground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Yui Mok/PA Wire)
Tube strike(37 of50)
Police look on as people queue for a bus at Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(38 of50)
BEST QUALITY AVAILABLE People stand on a cramped bus from Finsbury Park station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Becky Barnes/PA Wire)
Tube strike(39 of50)
People queue for a bus at Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(40 of50)
BEST QUALITY AVAILABLE People stand on a cramped bus from Finsbury Park station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Becky Barnes/PA Wire)
Tube strike(41 of50)
People queue for a bus at Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(42 of50)
People queue for a bus at Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(43 of50)
People queue for a bus at Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(44 of50)
Travellers are turned away at Paddington Underground station, London, as a strike by Underground workers closed the capital's entire Tube system. PRESS ASSOCIATION Photo. Picture date: Wednesday August 5, 2015. Members of four unions are taking industrial action for the second time in a month because of a deadlocked dispute over plans to launch a new all-night service next month. See PA story INDUSTRY Tube. Photo credit should read: Anthony Devlin/PA WireA closed sign at Waterloo Underground station, London, as a strike by Underground workers closed the capital's entire Tube system. PRESS ASSOCIATION Photo. Picture date: Wednesday August 5, 2015. Members of four unions are taking industrial action for the second time in a month because of a deadlocked dispute over plans to launch a new all-night service next month. See PA story INDUSTRY Tube. Photo credit should read: Anthony Devlin/PA Wire (credit:Anthony Devlin/PA Wire)
Tube strike(45 of50)
A man looks at a Tube map at a partially closed entrance at Paddington Underground station, London, as a strike by Underground workers closed the capital's entire Tube system. PRESS ASSOCIATION Photo. Picture date: Wednesday August 5, 2015. Members of four unions are taking industrial action for the second time in a month because of a deadlocked dispute over plans to launch a new all-night service next month. See PA story INDUSTRY Tube. Photo credit should read: Anthony Devlin/PA WireA closed sign at Waterloo Underground station, London, as a strike by Underground workers closed the capital's entire Tube system. PRESS ASSOCIATION Photo. Picture date: Wednesday August 5, 2015. Members of four unions are taking industrial action for the second time in a month because of a deadlocked dispute over plans to launch a new all-night service next month. See PA story INDUSTRY Tube. Photo credit should read: Anthony Devlin/PA Wire (credit:Anthony Devlin/PA Wire)
Tube strike(46 of50)
People queue for a bus at Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(47 of50)
People queue for a bus at Stratford station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:John Stillwell/PA Wire)
Tube strike(48 of50)
People walk past a closed Finsbury Park underground station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Yui Mok/PA Wire)
Tube strike(49 of50)
BEST QUALITY AVAILABLE People stand on a cramped bus from Finsbury Park station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Becky Barnes/PA Wire)
Tube strike(50 of50)
BEST QUALITY AVAILABLE People stand on a cramped bus from Finsbury Park station, London, as commuters and tourists face a day of travel chaos because of a strike which has closed the underground. (credit:Becky Barnes/PA Wire)
Workers had been set to stage two two-day strikes before the postponement, but they were called off at the last minute
as a “goodwill” gesture, according to Unite.
In July, unions staged their biggest walkout in 13 years over the introduction of the night tube.
The Rail, Maritime and Transport union (RMT) described the service as a "vanity project" of Mayor Boris Johnson, claiming it was "fundamentally flawed from top to bottom".