Circle line

The Circle line is a route across central London, with 36 stations. It opened in 1871, but as part of the Metropolitan Railway and didn't become an independent line until 1949. Prior to 2009, it was a circle from and direct to Edgware Road. In December 2009, the route was extended to Hammersmith, and the Hammersmith & City line was extended there in 2008. The route is nowadays coloured yellow on the Tube Map.