A total of 54 new DLR trains are set to come into use from 2024.
A walk-through design will increase capacity on each train by 10 per cent, Transport for London (TfL) said.
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The trains will also feature the latest audio and visual real time travel information, air conditioning and mobile device charge points.
Of the new trains, TfL said 33 will replace the oldest rolling stock, some of which are more than 30 years old and coming to the end of their design life.
A further 21 are set to boost capacity across the DLR network.
TfL claims the new trains will provide better facilities for those with mobility impairments with three multi-use areas and three dedicated wheelchair spaces.
According to TfL, the trains will go through rigorous testing which will initially take place in overnight engineering hours and during some planned closures.
Later this year, though, test trains will run during the day in gaps between normal services.
The 54 trains are being designed and built by Construcciones y Auxiliar de Ferrocarriles, S.A (CAF) after TfL awarded the contract in 2019.
Eleven of the trains have been funded by the Department for Levelling Up, Housing and Communities after TfL was successful in securing funding from the government’s Housing Infrastructure Fund.
These will be used to further increase capacity supporting the development of thousands of new homes around the network, particularly in the Royal Docks.
Mayor of London, Sadiq Khan, visited TfL's Beckton depot to see the first of the new trains.
He said: "I am delighted to to see the first of our brand new DLR trains that will provide Londoners with more frequent, reliable and comfortable journeys from 2024.
"The DLR's modernisation forms a key part of my vision to make London a greener, fairer and more prosperous city for all."
Andy Lord, London’s Transport Commissioner, added: "These new state-of-the-art DLR trains will transform journeys for our customers and help support future growth in east London, which benefits the UK’s economy as a whole.
"The trains will now go through testing ahead of introduction in 2024 to ensure they provide the reliability both we and our customers expect.
"I look forward to seeing these across the network and helping contribute to the DLR’s continuing success."
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