The Victoria line is a deep-level London Underground route running from the south (Zone 2) to the north-east (Zone 3) of London. It is coloured light blue on the Tube map. Unlike most other lines on the Underground, it runs entirely below ground. Constructed in the 1960s, it was the first entirely new tube line in London for fifty years, and was designed to relieve congestion on other lines, in particular the Piccadilly line and the West End branch of the Northern line.