London Underground 1973 Stock

in 1994|left In the early 1970s London Transport placed an order for a new fleet of trains to replace the 1938 Stock and 1959 Stock vehicles which previously operated on the Piccadilly line. Built between 1974 and 1977 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 units, being designed for airport travellers with luggage. The order was for 6-car trains, made up of 196 driving motor (DM) cars, 175 trailer (T) cars and 154 uncoupling non-driving motor (UNDM) cars. Each train is made up of two 3-car units, and most units are single-ended, formed DM-T-UNDM. There are also 21 double-ended units, formed DM-T-DM, to provide additional flexibility and to operate the Aldwych shuttle (now closed). The initial order included two test units equipped with solid state traction equipment and electronic control systems. These were double-ended units 892-692-893 (delivered 1977) and 894-694-895 (delivered 1979), and were known collectively as the ETT (Experimental Tube Train). The first unit was equipped by Westinghouse, the second by GEC. In order to provide additional units for the opening of the Heathrow loop, these units were converted to standard at Acton Works, entering service between 1986 and 1987. One three-car unit (166-566-366) was damaged in a terrorist attack on 7 July 2005 and subsequently scrapped. ==Refurbishment==

From 1996 to 2001, the entire fleet was refurbished by Bombardier Prorail at Horbury railway works. The interior was completely remodelled, with changes including the removal of transverse seating, replacement of the original wooden flooring with new floor material, replacement of straphangers with new grab rails, new enclosures for the ceiling ventilation fans, brighter lighting with new diffusers, installation of car-end windows and new perch seats in the centre of the cars, creating more luggage space for airport passengers. Interior dot-matrix displays were also introduced around this time, with later refurbished trains having a more compact surrounding than earlier refurbished cars. Automated voice announcements in the 1973 Stock as of today are notable for using the Julie Berry voice (used in various national rail services) as well as Adrian Hieatt for 'see it say it sorted' message. No other tube stock uses the Julie Berry voice. Both shall be phased out with 2024 Stock by a synthesised voice called 'Elloise'. The first refurbished unit re-entered service in June 1996, ==Future replacement==

The Deep tube programme (DTP) originally covered the replacement of the trains and signalling on the Bakerloo and Piccadilly lines, and had been expanded to cover rolling stock requirements arising from the planned extension of the Northern line to Battersea, the eventual replacement of Central line trains, and proposed increased service frequency on the Northern and Jubilee lines. The EVO tube concept design, a lighter articulated train with walk-through cars, was introduced early in 2011. Transport for London (TfL) has planned to replace Piccadilly Line trains in 2010 with the 2014 Stock to be delivered from 2015 onwards, with the two bidders of the contract; Alstom and CAF were bidded for the project. It was postponed, with the project being renamed to New Tube for London. In June 2018, TfL announced 94 nine-car 2024 stock trains to replace the 1973 Stock. As of early 2026, these are expected to enter service from the second half of 2026. All 1973 Stock trains will be decommissioned by 2030. ==References==