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Anyone ever tried this? Visiting all 270 stations on the tube network in one day? Official Guinness rules say you have to either arrive at or depart from a station by tube (or NR train if on the same tracks) but that you can use scheduled public transport - buses, trams etc but not cabs and also run. 270 stations include two separate "sites" for Edgeware Road, Paddington and Hammersmith. The running comes in for transfers between say Wimbledon and Morden (tominimise doubling back and wasting time).
I tried it recently, it's an interesting mix of the running side, logial problem solving to plan the route and adapting on the fly to issues that arise like a missed connection or suspended line.