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It might only serve 25 stations, but the Bakerloo line is one of the most important routes on the London Underground system - carrying more than 111 million passengers annually.

The line, which is coloured brown on the Tube map, opened between 1906 and 1915, and to this day many of its stations retain elements of their original Edwardian design.

Take a stroll around the stations below ground and you’ll spot many examples of the Art Nouveau decorative tiling designed by architect Leslie Green at the turn of the century.

Many of the above-ground stations also still retain Green’s distinctive ox-blood, red brick façade with their tell-tale semicircular first-floor windows. The most popular of these, of course, being Oxford Circus.

Unlike many other lines, the Bakerloo line has not had its route changed or extended since the 1930s - meaning the line terminates on the Southern branch at the relatively central Elephant and Castle.

You probably take this line to travel to Regent's Park for Sunday strolls, Waterloo to catch a train out of London and Lambeth North to go to the Imperial War Museum. But how much do you really know about the network that ferries millions of people around the capital?

Click through our gallery above to discover ten interesting facts about London's Bakerloo line.

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