GEC Transportation Projects Ltd., (GEC-TPL) was established in 1974 and was based at St Albans and Borehamwood, Hertfordshire. It specialised in the design, execution and management of major railway and mass transit electrification projects around the world. In 1981 GEC-TPL was transferred to Trafford Park in Manchester took over residual responsibility for vehicle design from GEC Traction, e.g. British Railways Class 91s and locomotive equipment design, e.g., British Railways Class 90s. GEC-TPL project managed 406 track kilometres of electrification in Taiwan in 1984. It involved the design, supply and installation of equipment including catenary, substations, telecommunications, locomotives and multiple units. The company also supplied the 134, 3-car trains and project managed the equipment of Lines 3 and 4 of Seoul Metropolitan Subway Corporation. Closer to home, GEC-TPL was the project management company for Phase 1 of the Docklands Light Railway and the Manchester ‘Metrolink’ and supplied the initial vehicles for both systems. In 1987, GEC-TPL contracted to supply the body mounted power equipment for the initial build of Trans Manche Super Trains, later known as ‘Eurostars’, the bar car mechanical parts for which were supplied by its long term partner Metropolitan Cammell which later became part of GEC-TPL in 1989. In 1989, GEC Transportation Projects Ltd became part of the joint company, GEC Alsthom Transportation Projects Ltd., when GEC and Alsthom of France, part of Compagnie Générale d’Electricité (CGE) formed GEC Alsthom. The combined company acquired Metropolitan Cammell at this time. (Alsthom’s name had earlier been derived from ‘Alsace Thomson-Houston’, thereby revealing its earlier parentage from Thomson-Houston of America, as also had the British Thomson-Houston Co., of Rugby, another GEC constituent). In 1998 the company formally changed its name to ALSTOM.

GEC Turbine Generators Ltd was a subsidiary of GEC. Although GEC sold its turbo-generators business in 1966, in the following year the company acquired AEI, which brought turbo-generators back. In 1969 the company established GEC Power Engineering, which included English-Electric AEI Turbine Generators Ltd. The business became known as GEC Turbine Generators Ltd around 1972. GEC Turbine Generators Ltd had its headquarters and steam turbine design centre at Rugby, whilst manufacturing for low pressure turbines was based at Trafford Park, and Stafford manufactured generators. Faced with a slow domestic market in the 1970s GEC Turbine Generators increasingly turned its focus to overseas markets. It won significant contracts for work on power stations in Hong Kong and South Korea, amongst other countries, and by October 1976 could boast that 60-70 percent of its business was in exports. The company was given the Queen's Award for Export Achievement for its steam turbines and associated generators for fossil-fuel and nuclear power stations in 1982. In 1998 GEC Turbine Generators was merged with Compagnie Générale d'Electricité (CEG) and became known as GEC Alsthom Turbine Generators Ltd.