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London's new night Tube is set to be extended to a third line within weeks of being launched, according to sources.

The all-night service will start on August 19 on the Central and Victoria lines, after agreement was finally reached with unions.

It is understood that the night Tube will be extended to the Jubilee Line from September 2.

Finn Brennan, district organiser of the train drivers' union Aslef, said: "We welcome the hundreds of new jobs with decent conditions that were created by our action last year.

"We made sure it was brought in by agreement in a way that benefits existing staff and the new recruits."

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(Image: PA)

The new service was originally due to start last autumn but was held up because no agreement was reached with unions.

The night Tube will be extended to other lines at a later date.

The breakthrough of tubes running throughout the night follows the acceptance of a pay deal by members of the two biggest Tube unions - Aslef and the Rail, Maritime and Transport union.

The Aslef union maintains that TfL could have introduced the Night Tube earlier, but it took 18 months of 'tortuous' negotiations before a deal on pay and conditions was agreed.

Previously speaking, Mr Brennan said: "We were always clear that we were in favour of night Tube.

(Image: PA)

"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 August, operated under agreements that have improved conditions for existing drivers and created hundreds of new jobs, and new Aslef members."