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This series contains correspondence, memoranda and extracts from minutes primarily concerning the construction, provision and maintenance of vehicles.

This series contains memoranda and extracts from minutes concerning improvements to rolling stock, failures and delays, the replacement of vehicles, new equipment and facilities, expenditure on modernisation, and the investigation and testing of equipment.

This series contains tests, drawings and photographs of railway rolling stock, including details of the surface lines of rolling stock replacement programmes, a proposed rolling stock programme for the District, Circle and Metropolitan Lines, Chairman's conference minutes including financial details, National Service for staff, matters approved by the Chairman for submission to the Board, Special Expenditure Requisitions (SERs), air raid precautions, engineering first class traffic, the standardisation of signs, a station proficiency competition and emergency measures on railways.

This series contains correspondence, memoranda, minutes and reports concerning the renewal and improvement of rolling stock on various lines including details of designs of rolling stock cars, the fiftieth anniversary of the District Line, the modernisation of equipment and the replacement of steam locomotives.