The Contracting Entity intends to purchase new tube gauge rolling stock to support the following programmes: a) Northern Line Extension (NLE), to support extension of the Northern Line service from Kennington to Battersea. b) Jubilee Line Upgrade (JLU2) and Northern Line Upgrade (NLU2), to support increases in service frequency and operating hours following the re-signaling of each line. The new rolling stock will be required to substantially replicate the gauging and operational characteristics of the existing Jubilee and Northern Line rolling stock in the form of a 'modern equivalent train'. Apart from specific differences associated with infrastructure and operating requirements for each line, the new rolling stock is expected to be of the same gauge and specification for each line. The purchase will also include technical, spares and other support services for a period of up to the anticipated design life of the new rolling stock.