designed and built by the St. Louis Car Company during 1966–67. Hawker Siddeley later sold the same general design to the MBTA in Boston for their Blue and Orange Lines. 70 48' cars were delivered to the Blue Line in 1978–80 and 120 65' cars were delivered to the Orange Line in 1980–81. Hawker Siddeley also manufactured much of the Toronto subway system's older rolling stock, the H5 and H6 models. The heavy rail manufacturing business, based in Mississauga and Thunder Bay, Ontario, are now part of Alstom. MBTA also bought a number of commuter rail coaches from the German firm Messerschmitt, thereby teaming Hawker Siddeley with its old World War II rival under the same organisation. Nationalisation of aircraft production On 29 April 1977, as a result of the Aircraft and Shipbuilding Industries Act 1977, Hawker Siddeley Aviation and Dynamics were nationalised and merged with British Aircraft Corporation (BAC) and Scottish Aviation to form British Aerospace. However, HSA and HSD accounted for only 25% of the Hawker Siddeley business by this time, and the non-aviation and foreign interests were retained by a holding company known as Hawker Siddeley Group Plc after 1980. Rationalisation and sale to BTR The group rationalised in the 1980s, focusing on railway engineering and signalling, industrial electronics and instrumentation and signalling equipment. Orenda Aerospace, the only remaining original company from the Avro Canada / Hawker Siddeley Canada era, although greatly diminished in size and scope of operations, became part of the Magellan Aerospace Corporation. The late 1980s also saw Hawker Siddeley divest itself of much of its other North American heavy manufacturing enterprises. Its Talladega, Alabama-based TreeFarmer heavy equipment business was sold to Franklin Equipment in 1990 and its Canadian rail car production facilities were split between SNC-Lavalin and Bombardier in 1992. In 1992, Hawker Siddeley Group Plc was acquired by BTR plc for £1.5bn. This was led by Alan Jackson and Sir Owen Green who were the CEO and Chairman of BTR respectively during this time. Through a series of takeovers, the business units finally became part of Schneider Electric in 2014. Hawker Siddeley name today In 1973, HS acquired the industrial electronics firm South Wales Switchgear. Later known as Aberdare Holdings, in 1992 this company was renamed Hawker Siddeley Switchgear (HSS). They have an Australian subsidiary, Hawker Siddeley Switchgear Australia. Another company which retains the name is Hawker Siddeley Power Transformers. In 1993,