The southern terminus of the Monon. Built in 1858. The station was formally opened on September 7, 1891 by the Louisville and Nashville Railroad. There was a claim made at the time that it was the largest railroad station in the Southern United States, covering forty acres. It served not only the L&N railroad, but also the Monon Railroad, the Pennsylvania Railroad and the Louisville, Henderson, & St. Louis, the latter eventually merging with the L&N. Many of those traveling to the Kentucky Derby would use the Union Station as their first place of celebration, with twenty special trains coming to the facility, and Pullman cars allowing overnight accommodations, a trend that continued until the mid-1960s. Three separate United States presidents arrived in Louisville by Union Station.