The Economist
New train technologies are less visible and spread less quickly than improvements to cars or planes. But there is still plenty of innovation going on, and ideas are steadily making their way out onto the rails
http://www.economist.com/news/technology-quarterly/21578516-transport-new-train-technologies-are-less-visible-and-spread-less-quickly?fsrc=scn/tw_ec/ideas_coming_down_the_track
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