Grenville M. Dodge of Council Bluffs, chief engineer of the Union Pacific Railroad, at Promontory, Utah, to mark the completion of the Transcontinental Railroad on May 10, 1869. "Castle Rock ...

The transcontinental railroad's construction touched the lives of hundreds of thousands of people. Some desired it, some built it, and some did everything in their power to stop it. Browse a photo ...

When the signal from the spike came through, the cannons fired. The world was put on notice: the transcontinental railroad was completed and America was moving to the forefront of the world's stage.