Date: 09/04/2013
Geoff Marshall is a man on an Underground mission. He desperately wants to break the world record for the Tube Challenge - visiting all 270 London Underground stations in the fastest time possible. This is his 24th attempt, but only once before has he got his name in the record books
External links
BBC News Magazine Video
Geoff Marshall is a man on a mission, to visit all 270 London Underground stops in the fastest time possible.
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