- 1Bus mechanical parts (GEC/2/2/2/248)
1939-1940, file - 2Trolleybus controllers and master lists of name plates (GEC/2/2/2/586)
1935-1978, file - 3Control switches and cylinders for trolleybuses (GEC/2/2/2/588)
1930-1947, file - 4Control cylinder for master switch layouts including for trolleybuses (GEC/2/2/2/596)
1930-1933, file - 5Resistance frames and flameproof equipment for railless buses (GEC/2/2/2/620)
1929-1953, file - 6Electrical equipment layouts for trolleybuses (GEC/2/2/2/626)
1933-1947, file - 7Small electric and battery locomotives and trolleybuses collector shoes (GEC/2/2/2/633)
1927-1938, file - 8Electrical equipment layouts including for South African Railways and Harbours, National Coal Board and Roan Antelope Trust (GEC/2/2/4/73)
1957-1989, file - 9Electrical equipment layouts including for South African Railways and Harbours (GEC/2/2/4/80)
1920-1957, file - 10British United Traction Limited Oporto trolleybuses and Leyland Motors for Dunedin trolleybuses project files (GEC/1/3/1)
1953-1960, file - 116EI locomotives, Medium Capacity Transit System Proposal, Melbourne Tramways Board - MG Sets, Moscow trolley buses and miscellaneous ordering drawings for EM2-B1 mines battery locomotives project files (GEC/1/3/2)
1972-1983, file - 12Rapidorail Systems, Seattle trolleybuses, London Transport energy storage scheme, Seoul Metro cars, London Docklands 'GTO' power scheme, Brazil Railways APC locomotives, Van Hool trolley bus and GEC Hong Kong Tuen Mun LRT locomotives project files (GEC/1/3/3)
1982-1987, file - 13National Coal Board & British Steel Corporation shunting locomotives, Simon-Carves coke car locomotives (Llanwen), Aldgate, Millwall & Newham dc motor scheme, Santa Barbara roadway electricfication technology and West Yorkshire Passenger Transport Executive trolley buses project files (GEC/1/3/5)
1972-1981, file - 14Aldgate, Millwall & Newham ac motor scheme, South Yorkshire - Sheffield Tramway, Pole changing D.E.M.U. and Victorian Railways project files (GEC/1/3/6)
1977-1984, file - 15Kearsley A.L.E.R.T. system & test track and Athens trolley bus project files (GEC/1/3/7)
1981-1985, file