- 1Drawing Office records (GEC/2)
1874-1994, sub-fonds - 2Engineering records (GEC/3)
1846-1993, sub-fonds - 3Drawings (GEC/2/2)
1874-1993, series - 4Weight books (GEC/3/3)
1934-1963, series - 5WG Bagnall Ltd drawings (GEC/2/2/8)
1925-1968, sub-series - 6Spares lists and mechanical parts (GEC/2/2/8/1)
1957-1968, file - 7Mechanical parts and arrangements (GEC/2/2/8/2)
1956-1961, file - 8Mechanical parts details (GEC/2/2/8/3)
1955-1958, file - 9Industrial loco mechanical arrangements and details (GEC/2/2/8/4)
1954-1955, file - 10Mechanical details (GEC/2/2/8/5)
1957-1967, file - 11Mechanical details (GEC/2/2/8/6)
1956-1958, file - 12Industrial locomotive mechanical details (GEC/2/2/8/7)
1958-1960, file - 13Mechanical details (GEC/2/2/8/8)
1956-1961, file - 14Mining locomotives mechanical details (GEC/2/2/8/9)
1960-1961, file - 15Mechanical details (GEC/2/2/8/10)
1956-1961, file