Here's how to visit all 270 London Underground stations in a single day. read more
Being sure to have found the real shortest time to visit all 270 tube stations is pretty difficult without calculating the time for every conceivable route (this is a travelling salesman type problem). read more
The "Tube Challenge" is the accepted name for the Guinness World Record attempt to visit all the stations on the London Underground network in the fastest time possible. The rules are here. The current record has stood since 2006. read more