In 1869, when the final spike was driven into the Transcontinental Railroad, few were prepared for its seismic aftershocks. Once a hodgepodge of short, squabbling lines, America’s railways soon exploded into a titanic industry helmed by a pageant of speculators, crooks, and visionaries. The vicious competition between empire builders such as Cornelius Vanderbilt, Jay Gould, J. P. Morgan, and E. H. Harriman sparked stock market frenzies, panics, and crashes; provoked strikes that upended th...