The Metropolitan line is the oldest underground railway in ... Over the coming weeks, we’ll be using maps to tell you the story of each of London’s Tube lines. The images used in this ...

The Circle line name was not used officially until 1936 – but its existence is fundamental to the Tube’s early beginnings.

It’s the second oldest Tube service in London, but it took 125 years for the Hammersmith & City line to be shown on the modern Underground map. Connecting to the Metropolitan Railway at ...