- 1Mechanical details for Pakistan and Western Brazil locomotives (GEC/2/2/1/16)
1957-1981, file - 2General outlines of electric locomotives (GEC/2/2/2/24)
1965-1968, file - 3Control equipment schemes and details (GEC/2/2/3/1)
1966-1967, file - 4Bogie and frame details for Pakistan Western Railway locomotives (GEC/2/2/13/2)
1980, file - 5Equipment layout and wiring diagrams (GEC/2/2/3/6)
1960-1986, file - 6General arrangements and outlines of diesel electric locomotives for UK & overseas railways (GEC/2/2/2/116)
1959-1973, file - 7Mechanical details for overseas locomotives (GEC/2/2/1/70)
1967-1975, file - 8Overseas railways painting diagrams and mechanical parts (GEC/2/2/1/75)
1967-1992, file - 9Overseas railways general arrangements of diesel electric locomotives (GEC/2/2/2/261)
1947-1956, file - 10Equipment frame details for overseas railways (GEC/2/2/2/530)
1955-1974, file - 11Mechanical parts for Pakistan Western Railway, British Rail Southern Region booster conversion, Portugal Railways and British Railways Board type 1 diesel electric locomotives (GEC/2/2/2/654)
1959-1967, file - 12Electrical equipment layouts including for South African Railways and Harbours, Netherlands Railways, and for Glasgow suburban conversion (GEC/2/2/34/9)
1967-1968, 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 - 14Pakistan Western Railway and Manchester-Sheffield-Wath Bo-Bo locomotives electrical equipment layouts including pantographs (GEC/2/2/34/32)
1967-1968, file - 15Electrical equipment layouts including for Pakistan Western Railway (GEC/2/2/34/77)
1968-1981, file
