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The 1992 Tube Stock is the type of train used on the Central line and Waterloo & City line of the London Underground. ==Construction== The 1992 Stock was built by BREL (later Adtranz and now Bombardier Transportation) for the Central line as the result of the extensive testing of the three 1986 tube stock prototype trains. Even so, the introduction of this stock was far from trouble-free and there were many technical teething problems. Eighty-five trains were ordered from BREL, each formed of four two-car units (two units have driving cabs, the others are fitted with shunting controls).〔 Upon entering service in April 1993, the new units gradually replaced the previous 1962 tube stock, which was finally withdrawn two years later. The trains were manufactured at the former BREL Carriage Works in Derby (Now the Bombardier Derby Carriage and Wagon Works). The propulsion for the trains was manufactured by a consortium of ABB and Brush Traction, and was one of the first examples of microprocessor controlled traction featuring a fibre-optic network to connect the different control units. The DC traction motors have separately-excited fields and are controlled via GTO (Gate turn-off) thyristors. A fault in a train of this type led to the derailment on 25 January 2003. The whole fleet had to be taken out of service for several months, which required the suspension of all services on the Central and Waterloo & City lines, to permit faulty bolts to be replaced. The 1992 stock's design is reminiscent of the 1986 prototypes. The new 2009 stock trains, built by Bombardier Transport for the Victoria line, are more like the 1992 stock in shape and design than the 1995/1996 stock. Due to ongoing problems regarding excessive carbon brush wear, the replacement of the DC motors was considered, but decided against. However the 1992 stock may still receive AC motors in the future. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「London Underground 1992 Stock」の詳細全文を読む スポンサード リンク
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