Alexandria Union Station is a historic railroad station in Alexandria, Virginia, south of Washington, D.C. To avoid confusion with nearby Washington Union Station, the station is often referred to as simply Alexandria. Its Amtrak code is ALX.

Washington Union Station, known locally as Union Station, is a major train station, transportation hub, and leisure destination in Washington, D.C. Designed by Daniel Burnham and opened in 1907, it is Amtrak's headquarters, the railroad's second-busiest station, and North America's 10th-busiest railroad station. The station is the southern terminus of the Northeast Corridor, an electrified rail line extending north through major cities including Baltimore, Philadelphia, New York City, and Boston, and the busiest passenger rail line in the nation. In 2015, it served just under five million passengers.