"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 the relationship between management and labor; transformed the nation’s geography;...