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, Tilbury and Southend Railway London, Tilbury and Southend Railway The London, Tilbury and Southend Railway (LTSR), also known as Essex Thameside, is a commuter railway line on the British railway system which connects Fenchurch Street station in central London with destinations in east London and Essex, including , , , , Tilbury, Southend and . Its main users are commuters travelling to and from London, particularly the City of London which is served by Fenchurch Street, and areas in east London including the Docklands financial district via London Underground and Docklands Light Railway connections at and . The line is also heavily used by