The Metropolitan line is the oldest underground railway in the world - here's a brief history of the route in four forgotten historic maps.

The Metropolitan line was the Underground’s first route to open, but over the next 160 years it has expanded to 11 lines, covering 250 miles of track. As the Tube network has evolved, so has the map ...

Taking two years to build, the initial Metropolitan Railway route ... line made use of steam trains to carry passengers between Paddington and Farringdon. Over the coming weeks, we’ll be using ...