First, I would like to express my appreciation to Hans Jenny, a friend and mentor for many years. It was he who encouraged me to undertake this work.
Next, access to the vast nineteenth-century resources of the Franklin Institute in Philadelphia made the project realizable. It was Joel Bloom, Director of the Institute and a friend since high school days, who facilitated that access. Helpful beyond measure was Stephanie Morris, Archivist at the Institute.
Although I found the staff of most research facilities that I visited or corresponded with friendly and cooperative, I must single out certain individuals at the Mary Jacobs Library in Rocky Hill. Helen Morris, Gail Madak, and Bobbie Woloshin, and the entire staff were especially patient, persistent, and effective in searching for elusive electronic-based data and print material.
Rich sources of information were the B&O Railroad Museum at Baltimore and the Union Pacific Historical Museum at Omaha. Anne Calhoun at the former and William Kratville at the latter were extremely cooperative. Susan Tolbert provided much assistance at the Library of the National Museum of American History in Washington, D.C. Charles Helfrich, Jr. extended himself to permit me to review the photo files of the Railroadians of America. By letter, Thomas T. Taber, III, freely offered information and pointed me to numerous others who could help.
Other important sources were the Railroad Museum of Pennsylvania, the Pennsylvania State Archives, The Engineering Societies Library, Princeton University Libraries, Rutgers University Library of Science and Medicine, the Illinois Institute of Technology Library, and the California State Railroad Museum Library.
Many, many others at libraries, museums, and historical societies nationwide inconvenienced themselves to help me find an old photograph or obscure information among their collections or to answer my queries promptly and extensively. Although too numerous to list here, I have cited other who provided illustrations in the appropriate credit lines.
Special thanks is due to my editor, Tawny Schlieski, who, in addition to insuring that all of my commas and hyphens were in the right places, uncovered several ambiguous passages and made numerous constructive suggestions. She, like the staff at Associated University Presses—Chris Retz, Brian Haskell, Melody Sadighi, Julien Yoseloff and Mary Ann Hostettler—made this a much better book.
If I have overlooked other individuals or organizations that provided valuable assistance, I apologize. The omission was not intentional but with so many helping, it was difficult to insure that all were recognized.
Finally, I would like to thank my wife, who patiently tolerated the long hours that I spent researching and preparing this manuscript.