Making art for London's railways

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Chantal Joffe was selected as one of the artists whose work will decorate the Crossrail platforms. The BBC's Vincent Dowd talks to Chantal about how she went about the commission for Europe's biggest civil engineering project in London UK. The 20 billion dollar project started in 2009 and opens later this year. (Photo: The works of Chantal Joffe whose art will be displayed on rail platforms. Credit: BBC)