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ACKNOWLEDGEMENTS
All of the following public transport undertakings were visited during the study to obtain up-to-date information on new developments and activities; we gratefully acknowledge their help in providing much valuable information and assistance:
A B Stockholms Sparvagar (Stockholm), Azienda Transporti Municipali (Milan), Bay Area Rapid Transit District (San Francisco), Berliner Verkehrs-Betriebe (Berlin), British Railways Board, Central Illinois Railroad, Chicago Transit Authority, Cleveland Transit System, Japanese National Railways, London Transport Board, Massachusetts Bay Transportation Authority (Boston), Montreal Transportation Commission, National Capital Transportation Agency (Washington), New York City Transit Authority, Osaka Municipal Transportation Bureau, Pennsylvania Railroad, Philadelphia Department of Public Property, Port Authority Trans-Hudson Corporation (New York), Regie Autonome Des Transports Parisiens (Paris), Teito Rapid Transit Authority (Tokyo), Toronto Transit Commission.