Ceremony for driving of the last spike at Promontory, Utah, linking the Union Pacific and Central Pacific, May 10, 1869

Photograph of a ceremony for driving of the last spike at Promontory, Utah, linking the Union Pacific and Central Pacific, May 10, 1869. Two men stand in center shaking hands while looking towards the camera. A large crowd of men dressed in suits stand around the two men, creating an empty space in the center. Two engine train cars are visible on both sides with the two facing each other. men stand on the engine. Photoprint reads "Associated American Railroad. Washington, D.C."