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This series contains correspondence, memoranda and extracts from minutes concerning the ventilation of underground railways, carriages and substations including details of different ventilation schemes.

This series contains correspondence, memoranda, minutes and reports concerning the railway including details of the development of stations, accidents, the rates of pay and conditions of service for staff, safety and maintenance matters, air raid precautions, the electrification of the railway and the letting of land and properties. Also contains accounts including details of revenue receipts and expenditure.

This series contains correspondence, memoranda and extracts from minutes including details of possible railway extensions, trolleybus and bus facilities, a survey of the passenger transport facilities in the London Passenger Transport area and other companies' interest in the Board's outer area.