Railroads altered the landscape of the United States. Within a few decades of the invention of the locomotive, railways stretched from coast to coast, enabling people and goods to travel far greater distances than ever before, completely altering our concept of time and space. And while railroads may seem like an old technology, they continue to be an essential means of transporting both good and people, and new technologies are making the railroads an increasingly relevant resource for the 21st century. This volume in the Greenwood Technographies series tells the life story of all aspects of railroad technology—everything from the structure of the track to communications to what powers the locomotive.