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Some people are really clever, and society is lucky to have them. Case in point: Matthew Somerville. Previously he put together a real-time map of every bus in London. Now he's done the same thing, but for the tube.
Take a look at the absolute beaut.
We could spend all day watching the yellow dots (representing trains), making their way between stations on the tube map. Somerville's map is even better than that, however. Want to know where the trains are on a geographical map of London? Well, you can do that too.
Or perhaps you want things a bit more MI6... there's an alternate skin for the geographic map that's an homage to a map seen in Skyfall.
The maps draw from the publicly available tube-countdown data, the very same data that feeds the next train information boards at stations.
That information can sometimes go wrong — ever seen a train go missing on said boards? Those errors are reflected rather amusingly in the map, as trains float about off course.
That's not a detractor in any way — it just adds to the charm of the map. If you click on any of the yellow dots, there's exact data on the train and the route it's on. Go on, have a play around with it.