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The London Underground is celebrating two years of the Night Tube.

For many revellers tired of using several buses to get home or night-shift workers looking for a shorter commute, the arrival of the night tube was warmly welcomed.

It has cut their journey times home by at least 20 minutes.

According to TfL, the Night Tube has been a success with 17 million journeys made so far.

Plans for the Night Tube were announced in 2014 by TfL and it was hoped that it would begin in September 2015. However it faced difficulties as a series of strikes over pay delayed it by nearly a year.

The 24-hour service, running on Friday and Saturday nights, was introduced on the Central and Victoria lines on August 19.

Images from the opening night showed bleary-eyed revellers munching on fast food after an enjoyable night out in the capital.

Even the Mayor of London decided to take a trip on the Victoria line on its opening night.

Following its success, it now runs also runs on the Piccadilly, Jubilee, Overground and Northern (via Bank) lines.

It is thought that the Circle line is likely to be the next Night Tube line meaning that the 24-hour service will connect to all mainline train stations.

While the DLR is also poised to become 24-hours in the future.

There are long-term hopes to extend it to the District and Metropolitan lines and on Crossrail between Paddington and Abbey Wood after it opens.

Research has predicted that the Night Tube will contribute more than £1.5 billion to London’s economy over the next 10 years, which is double the initial projections.

Sadiq Khan said: “I am delighted to have delivered London’s first-ever Night Tube for Londoners. Its first two years have been an even bigger success than we predicted – allowing more people to get home quickly and safely after a night shift, or night out with friends, but also providing a huge boost to London’s night-time economy.

“In the past year we have also launched the Night Overground and I look forward to extending the service to more Underground lines to help even more people travel around our city more safely and quickly.”