The Detailed Map Of London Underground Zones Pictures
The system's aboriginal tunnels were congenital just beneath the apparent application the cut and awning method. Later, annular tunnels – which accord acceleration to its appellation the Tube – were dug through the London Clay at a added level. The aboriginal curve were marketed as the UNDERGROUND in the aboriginal 20th aeon on maps and signs at axial London stations. The clandestine companies that endemic and ran the railways were alloyed in 1933 to anatomy the London Passenger Carriage Board. The accepted operator, London Underground Limited (LUL), is a wholly endemic accessory of Carriage for London (TfL), the approved association amenable for a lot of elements of the carriage arrangement in Greater London.