Can you find a route around the London Underground map taking in exactly one stop on each line (including DLR and Overground)? That is, get on the tube at one station, go one stop, change to another line, lather, rinse, repeat until you've been on every line.

I have a solution (plus its reverse, and variations on the two end points or course). I don't know that it's a unique solution. It's pretty easy to prove that it can't be done if you include the Air Line though.

It took me about 90 minutes, but I admit towards the end I gave up on cleverness and just tried a few educated guesses about what a solution was likely to look like. 
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