One last post for the Tube’s 150th birthday (it’s still the 9th of January here on the West Coast of the United States!). This is the oldest map I can find that shows what would later be known as the London Underground: an 1889 map of London’s railways – still some 26 years after the first part of the Metropolitan Line opened.

Main line routes are shown in red and the newfangled “underground lines” are shown in blue. The newly completed Circle Line – a cooperation between the two competing Underground operators – can clearly be seen on the map.

Source: Retronaut – link no longer active