Central line (London Underground) that the transport benefits of a Park Royal station on the Central line are not sufficiently high to justify the costs of construction. Central line (London Underground) The Central line is a London Underground line that runs through central London, from , Essex, in the north-east to and in the west. Coloured red on the Tube map, the line serves 49 stations over , which makes it the longest Tube line. It is also one of only two lines on the Underground network to cross the Greater London boundary, the other being the Metropolitan line. One of London's deep-level railways,
East London line line to the South London line with a terminus at , opened on 9 December 2012, creating an orbital railway around inner London. The East London Railway was created by the East London Railway Company, a consortium of six railway companies: the Great Eastern Railway (GER), the London, Brighton and South Coast Railway (LB&SCR), the London, Chatham and Dover Railway (LCDR), the South Eastern Railway (SER), the Metropolitan Railway, and the District Railway. The latter two operated what are now the Metropolitan, Circle, District and Hammersmith & City lines of the London Underground. The incorporation of the ELR took place