A CKNO WLEDGMENTS 



The author wishes to express his appreciation for the help 

 given him by the many individuals, including railroad 

 officials, librarians, and museum curators, who provided 

 answers to many questions and confirmed many conjectures. 



Special thanks are tendered A. B. Lawson and Lawrence 

 W. Sagle of The Baltimore and Ohio Railroad Co., F. V. 

 Koval of the Chicago and North Western Railway System, 

 W. F. Kascal and Harry B. Spurrier of the New York Cen- 

 tral System, H. T Cover of the Pennsylvania Railroad Co., 

 Harry E. Hammer of the Reading Co., K. C. Ingram of the 

 Southern Pacific Co., Elizabeth O. Cullen of the Associa- 

 tion of American Railroads, D. M. MacMaster of the Mu- 

 seum of Science and Industry at Chicago, H. D. Watson of 

 the University of Maine, George M. Hart of George School 

 in Bucks County, Pa., and Robert R. Brown of Lachine, 

 Quebec — to name a few of those whose contributions have 

 helped bring together the facts here presented. 



It is fitting also at this time to refer to the late Charles B. 

 Chaney, who collected over a period of almost 60 years an 

 immense number of photographs, negatives, drawings, litho- 

 graphs, and books dealing with railroading. Upon his death 

 in 1948, he left this entire collection to the United States 

 National Museum, of the Smithsonian Institution, confident 

 that in the Museum it would be put to the widest possible use 

 and would, therefore, carry forward his lifelong work of 

 research in the history of locomotives and railroads. 



His confidence was well founded. The Chaney collection 

 of railroad material has been an invaluable source of 

 information for the present work. 



To acknowledge the contribution of Thomas Norrell of 

 Silver Spring, Md., is likewise a pleasure. He graciously 

 consented to read the manuscript of this work, and his 

 authoritative comments have greatly enhanced its compre- 

 hensiveness and accuracy. 



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