PHILIP BAGWELL was Professor Emeritus in History at the Polytechnic of Central London and a recognised authority on transport history and the history of industrial relations. He was a consultant on these subjects for BBC schools television. His principal published writings include The Railway-men: a history of the NUR (two vols. 1963 and 1982); The Railway Clearing House in the British Economy 1842-1922 (1970); The Transport Revolution from 1770 (1974); Indus-trial Relations (1974) and (with G.E. Mingay) Britain and America: a study of economic change 1850-1939.