- 1Drawing Office records (GEC/2)
1874-1994, sub-fonds - 2Drawings (GEC/2/2)
1874-1993, series - 3Clayton Equipment Co Ltd drawings (GEC/2/2/28)
1957-1967, sub-series - 4Mechanical parts including cab floor arrangements and layouts of conduits (GEC/2/2/28/1)
1962-1963, file - 5Piping, brake and cab arrangements for a type 1 locomotive (GEC/2/2/28/2)
1961-1967, file - 6Casing covers and frames, plates, brackets, asbestos mattresses and other mechanical parts (GEC/2/2/28/3)
1963, file - 7British Railways diesel electric locomotives type 1 mechanical parts (GEC/2/2/28/4)
1961-1962, file - 8Mechanical parts for a diesel electric type 1 locomotive (GEC/2/2/28/5)
1962-1967, file - 9Mechanical parts including arrangements of cab window, hand brake cross shaft, safety straps and rail guard and pins (GEC/2/2/28/6)
1957-1961, file - 10British Railways type 1 diesel electric locomotive mechanical parts (GEC/2/2/28/7)
1957-1959, file - 11British Railways type 1 diesel electric bo-bo locomotive mechanical parts (GEC/2/2/28/8)
1958, file - 12Diesel electric meter gauge co-co locomotive mechanical arrangements and details (GEC/2/2/28/9)
1958-1959, file - 13Mechanical arrangements and details including for an explorer locomotive (GEC/2/2/28/10)
1957-1959, file - 14Mechanical arrangements and details (GEC/2/2/28/11)
1957-1958, file