Andrew J. Russell, (American, 1829–1902), Promontory Trestle Work and Engine No. 2, 1869, albumen silver print, courtesy Union Pacific Railroad Museum

The photographs on display in Race to Promontory document the 150th anniversary of the transcontinental railroad, but they only tell part of the story. Imagine what the photographers left out of the pictures by drawing the rest of the story outside the photo frame.