As London's Docklands Light Railway (DLR) celebrates its 30th anniversary, we look at the original construction and steady three-decade expansion of this successful urban railway. For more videos by The B1M subscribe now - http://ow.ly/GxW7y

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Images courtesy of TFL, Mattbuck, Felix O, Dr Neil Clifton, Sludge G, Tom Page, Gumble 44, Sunil060902, Robert Camp, Tom Page, Sludge G And Matt Buck.

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