The First Transcontinental Railroad was officially completed at Promontory Summit, Utah Territory, on May 10, 1869. The event is famously known for the driving of the "Golden Spike" (the Last Spike), which ceremonially joined the tracks of the Central Pacific Railroad, which built eastward from Sacramento, and the Union Pacific Railroad, which built westward from Omaha. This monumental achievement connected the Atlantic and Pacific coasts by rail for the first time, revolutionizing travel and commerce in the United States. While the location is sometimes colloquially and incorrectly referred to as "Promontory Point" (which is a different geographic feature nearby), the official historical site where the engines No. 119 and Jupiter met nose-to-nose is Promontory Summit. Today, the location is preserved as the Golden Spike National Historical Park, where visitors can see reenactments and the original site of the unification.