- 1Administration records (GEC/1)
1920-1993, sub-fonds - 2Drawing Office records (GEC/2)
1874-1994, sub-fonds - 3Engineering records (GEC/3)
1846-1993, sub-fonds - 4Sales and commercial records (GEC/4)
1849-1996, sub-fonds - 5Reports (GEC/1/1)
1920-1993, series - 6Files (GEC/1/3)
1953-1993, series - 7Drawings (GEC/2/2)
1874-1993, series - 8Order books (GEC/3/1)
1846-1974, series - 9Ordering schedules (GEC/3/2)
1946-1960, series - 10Weight books (GEC/3/3)
1934-1963, series - 11Order files (GEC/3/4)
1945-1968, series - 12Manuals (GEC/3/6)
1913-1984, series - 13Diagram books (GEC/3/7)
1951-1956, series - 14Publications (GEC/4/1)
1904-1996, series - 15Photographs (GEC/4/2)
1849-1986, series