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Commuters make their way on the escalator at Angel underground station on March 5, 2012 in London, England. The escalators at Angel tube station are the longest escalators on the tube network. London's underground rail system, commonly called the tube, is the oldest of its kind in the world dating back to 1890. It carries approximately a quarter of a million people around its network every day along its 249 miles of track and 270 stations. The network has undergone several years of upgrade work and refurbishment in preparation for the Olympic Games which take place this summer. During this time the tube is expected to carry millions of visitors to and from the Olympic Parks. (Photo by Dan Kitwood/Getty Images)
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