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The 1973 Tube Stock is a class of deep-level train that operates on the Piccadilly line of the London Underground. It was introduced into service in 1975 with the extension of the line to Hatton Cross in 1975, followed by a further extension to Heathrow Central in 1977. Built by Metro Cammell between 1972 and 1975, the stock was refurbished by Bombardier Transportation between 1996 and 2001. ==Construction== In the early 1970s London Transport placed an order of 88 trains to replace the 1959 stock, the 1938 stock and 1962 stock vehicles which previously operated on the Piccadilly line. Built between 1972 and 1975 by Metro Cammell in Birmingham, the first unit entered service on 19 July 1975 and the last was introduced by 1977. The trains featured longer cars and larger door space than the previous ones, being designed for airport travellers with luggage. The stock was refurbished by Bombardier Transportation between 1996 and 2001.〔(【引用サイトリンク】title=1973 )〕 Changes included the removal of transverse seating, strap hangers replaced with grab bars, new floor material, and a full repaint into London Underground's corporate livery.〔 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 1973 Stock」の詳細全文を読む スポンサード リンク
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