Design for the 'New Tube for London' revealed

The New Tube will be introduced first on the Piccadilly line, followed by the Bakerloo, Central and Waterloo & City lines.

"Its innovative design will also allow for air-cooling for the first time on deep-level sections of the Tube," read an official statement issued by the LU.

The train - designs for which are part of a new public exhibition at King's Cross St Pancras Underground station - also features improved accessibility, with step free access from the platform as well as walk-through carriages and wider doors.

The introduction of new trains and a better Tube service will help the Underground keep pace with London's rapidly rising population and support the city's economy.

The building of the 250 new trains, which will feature attractive internal styling that echoes the Underground's heritage, will also help to support new jobs and growth elsewhere in the UK. 

Transport for London's (TfL) team has been working with transport design specialists PriestmanGoode to ensure that there was a balance between the design and function of a train that will serve London for decades to come, and respect the world-renowned and instantly recognisable design heritage of London Underground.

The Mayor of London, Boris Johnson, said: "These innovative, eye-catching and sleek new trains will be vital for the continued modernisation of London Underground. From Greenford to Gants Hill, from Alperton to Arnos Grove, they will ferry millions of people across our city, more comfortably, reliably and stylishly than ever before. The New Tube marks a significant step forward in giving Londoners and visitors the accessible and modern transport service that they expect and deserve.These beautiful, air-cooled machines represent the best of British design and innovation. They will help to keep London and its economy moving in the right direction." 

The trains will serve London for more than 40 years and will be designed and built to be capable of fully automatic operation.

When the new trains first enter service they will have an operator on board. Along with modernised signal systems operating alongside them, the trains will enable faster, more frequent and reliable services with fewer delays, as well as providing greater capacity on all four lines:

Paul Priestman, Designer and Co-founding Director of PriestmanGoode, said: "London's Tube is one of the most iconic trains around the world. We are proud to have designed something that is part of the very fabric of London life, celebrating all that's great about London's environment; cutting edge technology, rich history and diversity."

The New Tube for London exhibition is at King's Cross St Pancras Underground station, Northern ticket hall, from Thursday until Nov 16.

The exhibition features images of the New Tube design, including a fly-through film, giving Londoners a glimpse into the future. 

A formal Invitation to tender is expected to be issued in early 2015 and a contract to build the new trains to be awarded in 2016. The first train is expected to come into service on the Piccadilly line in 2022.