ILLUSTRATION CREDITS:

Library of Congress; Library of Congress; Reproduced from Scientific American; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Courtesy Thayer Estate; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Library of Congress; Reproduced from Scientific American; Reproduced from Station to Station; Library of Congress; Library of Congress; Library of Congress; Library of Congress; Reproduced from King’s Books; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Library of Congress; Library of Congress; Hagley Museum and Library; Reproduced from Before the Colors Fade, A Personal History of Gibbs & Hill; 137: Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Library of Congress; Library of Congress; National Museum of American History/Smithsonian Institution; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; National Museum of American History/ Smithsonian Institution; Library of Congress; Collection of John Turkeli; Reproduced from King’s Books; Library of Congress; Library of Congress; Library of Congress; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Collection of John Turkeli; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Library of Congress; Pennsylvania State Archives, Manuscript Group 286, Penn Central Railroad Collection; Eddie Hausner/The New York Times.