Transport for LondonPublic Private Partnership
Under the 30-year PPP contract, three infrastructure companies (infracos) were responsible for the maintenance and renewal of London Underground's (LU's) assets - its rolling stock, stations, tracks, tunnels and signals.
The Tube network is divided into three infraco groupings. Tube Lines remains responsible for the Jubilee, Northern and Piccadilly lines (JNP) under the PPP contract.
This requires that they deliver a certain level of daily asset performance, and that they upgrade the assets to deliver improved capability in the longer term. They are subject to financial incentives or penalties based on their delivery against the performance levels set out in the contract.
The remaining two infracos, covering the Bakerloo, Central, Victoria and Waterloo & City lines (BCV) and the Circle, District, Hammersmith & City and Metropolitan, or 'sub-surface' lines (SSL), were the responsibility of Metronet, but are now part of LU.
Contractual performance
The 30-year contract is reviewed every seven and a half years. Tube Lines' contract was signed in December 2002.
LU closely manages the PPP contracts to ensure maximum value.
Each year, LU publishes a PPP & Performance report, which covers all Underground lines. It details performance and assesses what needs to be done to make sure promised improvements are delivered.
LU also publishes four weekly PPP Performance reports with detailed information on maintenance and renewal work on all Underground lines.
