# diamond geezer

### Friday, October 10, 2003

Tube quiz (5) All change
(Just the one problem today, but it's a really tough one)
The problem: There are 12 tube lines in London, plus the Docklands Light Railway. Your challenge is to identify a journey that travels along each of these 13 lines once, and travels exactly one station along each line.
Note: No walking from one station to another is permitted. You may not use transport other than these 13 lines (no buses, taxis, Thameslink, etc). After travelling one station along any line, you must change to another line.
Example: Start at Farringdon, travel on the Circle Line to Kings Cross, travel on the Northern line to Euston, travel on the Victoria line to Warren Street... and now you're stuck because you've already travelled on both the lines passing through this station.
The solution: As far as I know, this problem has a unique solution (apart from a couple of different options for the first and last stations on the route).
A hint to get you started: If you think about it, there's a couple of one-stop journeys that must be part of the correct route.
Chance of you lot coming up with the correct answer: Very small. Go on, prove me wrong.
(Bloody impressive James, spot on: Well done. And all while the rest of us were asleep.)

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Life viewed from London E3