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Revealed after three years of design work, here are the deep tube trains Londoners will be riding until the middle of the century. Although the designers are being coy over full automation - a politically sensitive area - with features like active displays replacing the internal advertising and route signage, the removal of internal car divisions, and new door designs for swifter passenger movements, the constraints of the capital's venerable tunnels and stations are being pushed as far as possible. Bonus info in article: what unique features China and New Zealand demand for their next-gen trains metafilter.com