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,
London Underground L Stock numbered 700-714 (even numbers only), were initially owned by the London Midland and Scottish Railway. The L Stock was based on the 1927 K Stock. The conversion from L Stock to Q31 Stock took place in the late 1930s, with the major modification being the conversion of the hand-operated sliding doors to air operation. The last Q Stock trains were withdrawn in 1971. London Underground L Stock London Underground L Stock was a clerestory-roofed rail stock built for the District line in 1932 and subsequently absorbed into the London Underground Q Stock, being redesignated Q31 Stock. The L Stock trains