The London Underground, started in 1863, is the the oldest metro system, and remains the longest in the world. The nickname "Tube" comes from the circular tube-like tunnels through which the small-profile trains travel. Drivers of the licensed black cabs must pass a test for which they need to memorize up to 25,000 streets. The most famous double-decker bus in the world, the red London double-decker busses were created as a means of carrying large numbers of passengers without exceeding legal limits on vehicle length.
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