- 1National Coal Board mechanical parts for type DBF battery locomotives for Bold & Bradford Collieries (GEC/2/2/4/57)
1955, file - 2A proposed Bo-Bo underground diesel electric locomotive, a mobile power converter truck, a 25 ton battery locomotive for the Beas Dam project and a proposed conversion of Class 1E locomotive for battery operation (GEC/2/2/3/13)
1966-1968, file - 3Mechanical and electrical details including for National Coal Board outlines of locomotives for Penallta, Bowhill, and Markham collieries, Central Argentine Railway, South African Railways and Harbours and Metropolitan-Vickers Electrical Co Ltd (GEC/2/2/34/66)
1958-1975, file
