So, yesterday morning I logged onto the forum of the Tube Challenge community - a clique of Londoners (and, oddly, Scandinavians) who's holy grail is the official Guinness World Record for visiting - that is, arriving to and/or departing from by train - each of the 270 stations on the London Underground network in the shortest time possible. The challenge is a rather hardcore pursuit which I've attempted numerous times a few years back, including a few times for charity. Despite what you might think it does NOT involve just sitting on trains all day; after the insane amount of planning you need to do, it involves basically spending at least 18 hours running up and down escalators, over passageways, and through the streets of strange suburbs of the city you've never heard of before, while
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