. Principes du transport ferroviaire . e les entreprises qui ont entrepris la construction de locomotives a été celle fondée à Philadelphie par MatthiasBaldwin, dont le premier moteur, les Old Ironsides, est apparu en 1832. Jusqu'au 1er juin 1920, la Baldwin Locomotive Worksconstruisit plus de 45,000 locomotives, et en période prospère, elle en construit plus de 2,000 chaque année. L'influence de George Stephenson, d'Angleterre, et de sa célèbre locomotive, le Rocket, a été ressentie dans les États de Lnité, mais, compte tenu de l'indéveloppé conditionof American industries en 1830, un nombre étonnamment petit de l'anglais fr

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. Principles of railroad transportation . e firms which early undertook locomotive con-struction was the one founded in Philadelphia by MatthiasBaldwin, whose first engine, the Old Ironsides, appeared in1832. Up to June 1, 1920, the Baldwin Locomotive Worksconstructed more than 45, 000 locomotives, and in prosper-ous times it builds more than 2, 000 each year. The influence of George Stephenson, of England, andof his celebrated locomotive, the Rocket, was felt in theLnited States, but, considering the undeveloped conditionof American industries in 1830, a surprisingly small num-ber of English engines were imported. The needs of ourrailroads were mainly supplied by our own foundries andshops. Nor were British models followed to much extent.American designers followed new lines in order to meetnovel conditions. They were so successful in making en-gines that would work on curves and climb grades 48 RAILROAD TRANSPORTATION that American locomotives soon began to be sold inEngland. As compared with the locomotives with which we are. The Old Ironsides, 1832 now familiar, those built in 1830 seem tiny and curiouslydesigned. The first locomotives constructed for actual serv-ice weighed from 3 to 5 tons; the weight of the De WittClinton was 3^2 tons. The English engines imported were

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