With the current record being at 16 hours, 29 minutes and 13 seconds, Geoff Marshall is at his 24th attempt at visiting all 270 London Underground subway stations in the fastest time possible.
Rules dictate that competitors must arrive or leave from all 270 stations on the network on a tube train, and are allowed to run, or use all forms of public transport to get between stations. However, no forms of private transport are allowed, such as cars, taxis or bicycles.
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