Tube Lines Limited, initially known as 'Infraco JNP' (an amalgamation of infrastructure and company), is an asset-management company responsible for the maintenance, renewal and upgrade of the infrastructure, including track, trains, signals, civils work and stations, of three London Underground lines. Originally a consortium of private companies, Tube Lines was one of two infrastructure companies (the other being Metronet) who entered into a public-private partnership (PPP) with London Underground in 2003. More information...
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