J. Parker Lamb has been photographing America's railroads since 1949 and writing about them since 1960. An early interest was the transition, during the1950s, from steam to diesel power in the South, where he grew up. Since then his work has allowed him to travel extensively, recording the evolution of rail technology throughout the U.S. and Canada for a half century. Lamb's photography has appeared in numerous magazines and scores of books. This is his fourth book. The previous three are Classic Diesels of the South; Katy Diesels to the Gulf; and Steel Wheels Rolling: A Personal Journal of Railroad Photography. After a 42-year career as a mechanical engineer, he is now retired in Austin, Texas.