- 1Drawing Office records (GEC/2)
1874-1994, sub-fonds - 2Engineering records (GEC/3)
1846-1993, sub-fonds - 3Drawing registers (GEC/2/1)
1905-1983, series - 4Drawings (GEC/2/2)
1874-1993, series - 5Order files (GEC/3/4)
1945-1968, series - 6Manuals (GEC/3/6)
1913-1984, series - 7Ruston & Hornsby Ltd drawings (GEC/2/2/24)
1952-1962, sub-series - 8Mechanical details (GEC/2/2/24/1)
1957-1961, file - 9Mechanical parts and painting diagrams for LSSE locomotive (GEC/2/2/24/2)
1961-1962, file - 10Mechanical parts for diesel electric shunter locomotive numbers 2985-2998 (GEC/2/2/24/3)
1952-1960, file - 11Drawing schedules (GEC/2/5)
1930-1954, series - 12Schedule of apparatus (GEC/3/8)
1948-1975, series - 13Ruston & Hornsby Ltd drawing schedule (GEC/2/5/2)
1948-1954, file - 14Northern Ireland Railway Co, Woodall-Duckham Construction Company, Stock, Otto-Simon Carves for Port Talbot and Ruston & Hornsby French Delegation order files (GEC/3/4/2)
1945-1968, file - 15Diesel electric locomotive schedule of apparatus files (GEC/3/8/4)
1961-1967, file