Evolution of the London Underground map. From 1895 to present day. 
(Pictured above: Maps from 1908, 1927, and 2013).  Evolution of the London Underground map. From 1895 to present day. 
(Pictured above: Maps from 1908, 1927, and 2013).  Evolution of the London Underground map. From 1895 to present day. 
(Pictured above: Maps from 1908, 1927, and 2013).