- 1Control equipment schemes and details (GEC/2/2/3/1)
1966-1967, file - 2Control apparatus equipment drawings (GEC/2/2/3/4)
1971-1973, file - 3Southern Railway wiring diagrams (GEC/2/2/2/74)
1937-1940, file - 4Wiring diagrams and mechanical details (GEC/2/2/3/5)
1962-1979, file - 5Equipment layout and wiring diagrams (GEC/2/2/3/6)
1960-1986, file - 6Electrical control apparatus, wiring diagrams and equipment layouts (GEC/2/2/4/6)
1971-1989, file - 7Electrical equipment drawings (GEC/2/2/3/8)
1963-1964, file - 8Mechanical details (GEC/2/2/2/128)
1962-1963, file - 9Diagram of connections (GEC/2/2/2/150)
1932-1951, file - 10General arrangements for Post Office (London) Railway and overseas railways (GEC/2/2/2/179)
1947-1975, file - 11Southern Railway stock wiring diagrams (GEC/2/2/2/304)
1924-1970, file - 12Wiring diagrams including for British Railways ac locomotives AL5 (Class 85) and London Transport 1967 tube stock (GEC/2/2/34/17)
1966-1967, file - 13Electrical equipment including relays, Glagow Suburban M.U. stock wiring diagrams, Pakistan Western Railway schematic diagrams and London Transport Board 1967 tube stock (GEC/2/2/34/21)
1966-1979, file - 14Wiring diagrams including London Transport Board c 1969 stock and South African Railways and Harbours (GEC/2/2/34/26)
1968-1969, file - 15Indian Government Railways and British Railways schematic and wiring diagrams including for London Transport Executive Victoria Line trial with 1960 tube stock (GEC/2/2/34/33)
1962-1965, file