supply the Central line with extra 1992 stock. This never happened and the trains were sent to Mayer Perry or CF Booth of Rotherham to be scrapped. The fleet was refurbished between 1991 and 1995 by Tickford at Rosyth Dockyard. From 2016 to 2018, the fleet was again refurbished at Acton Works to enable the trains to remain in service until their forecast replacement date of 2035. The class received the Class 499/2 designation on British Rail's TOPS system to operate on the Bakerloo line north of Queens Park. Roster Future replacement In the late 1990s, the Labour government initiated a public–private partnership (PPP) to reverse years of underinvestment in London Underground. Under the PPP contract, Metronet (the private consortium responsible for the Bakerloo line) would order new rolling stock for the Bakerloo line. This would take place following the delivery of 2009 Stock and S Stock trains, with an order for 24 new Bakerloo line trains. These would have entered service by 2019. However, Metronet collapsed in 2007 after cost overruns, and the PPP ended in 2010. In the mid 2010s, TfL began a process of ordering new rolling stock to replace trains on the Piccadilly, Central, Bakerloo and Waterloo & City lines. A feasibility study showed that new-generation trains and resignalling could increase capacity on the Bakerloo line by 25%, with 27 trains per hour. In June 2018, the Siemens Mobility Inspiro design was selected. These trains will have an open-gangway design, wider doorways, air conditioning and the ability to run automatically with a new signalling system. TfL could only afford to order Piccadilly line trains at a cost of £1.5bn. However, the contract with Siemens includes an option for 40 trains for the Bakerloo line in the future. This would take place after the delivery of the Piccadilly line trains in the late 2020s. Based on a November 2021 paper, due to a lack of funding, this might not happen until the late 2030s or early 2040s, when the trains would be 60 to 70 years old — probably double their design life. Since the withdrawal of the Class 483 on the Isle of Wight, the 1972-stock trains have become the oldest non-heritage trains running in the United Kingdom. Post-withdrawal use Asset Inspection Train Middle two cars are 67DM vehicles - 3079, 3179. Front 2 and rear two are 72 Mark 1 stock Front two (72 Mark