- 1Wiring diagrams (GEC/2/2/2/70)
1954-1957, file - 2General arrangements and outlines of diesel electric locomotives for UK & overseas railways (GEC/2/2/2/116)
1959-1973, file - 3Mechanical layouts for overseas railways (GEC/2/2/2/204)
1954-1965, file - 4Nigerian Railways mechanical details (GEC/2/2/5/7)
1953-1954, file - 5Overseas railways general outlines of Bo-Bo and Co-Co electric locomotives (GEC/2/2/2/235)
1949-1957, file - 6Bogie arrangements, general outlines and longitudinal sections of diesel electric industrial locomotives (GEC/2/2/1/93)
1964-1980, file - 7Nigerian Railway mechanical parts for 2-8-2 superheated engines (GEC/2/2/5/34)
1946, file - 8RENFE locomotive number 7701, Indian Railways, Nigerian Railways and British Transport Commission general outlines and mechanical details (GEC/2/2/2/312)
1949-1956, file - 9Nigerian Railway and Nyasaland Railway 2-8-2 locomotive mechanical details (GEC/2/2/5/53)
1953-1954, file - 10Lifting diagrams, shackles and slings for overseas railways including Nigerian Railways, Nyasaland Railways and Burma Railways (GEC/2/2/5/56)
1934-1952, file - 11Lifting beam extension, lifting hooks, shackles, and gears for electric locomotives for overseas railways (GEC/2/2/5/57)
1935-1952, file - 12Mechanical parts for the British Transport Commission DE & DH prototype locomotives and for overseas railways locomotives including Queensland Government Railway, Central Argentine Railway, Nigerian Railway, Buenos Aires & Pacific Railway, Great Western Railway and RFDN (Brazil) (GEC/2/2/5/70)
1952-1956, file - 13Locomotive mechanical parts for overseas railways and for the British Transport Commission DH & DE locomotive prototype (GEC/2/2/5/72)
1953-1956, file - 14Mechanical parts for overseas railways including Nigerian Railway, RFDN, Brazil, Buenos Aires & Pacific Railway, Ghana Railways and Harbours, Gold Coast Government Railway, Central Argentine Railway, and New Zealand Railway (GEC/2/2/5/73)
1953-1955, file - 15Mechanical parts for overseas railways (GEC/2/2/2/362)
1947-1954, file