One hundred forty years ago, four men rose from their position as middle-class merchants in Sacramento, California, to become the force behind the transcontinental railroad. In the course of doing so, they became wealthy beyond any measure--and to sustain their power, they lied, bribed, wheedled, and, when necessary, arranged for obstacles, both human and legal, to disappear. Their names were Collis Huntington, Leland Stanford, Charles Crocker, and...