Trains line Union Station as the carry passengers around the US. Union Station is a major train station, transportation hub, and leisure destination in Washington, D.C. Visited by 32 million people a year, Union Station is one of the busiest train stations in the country and is served by Amtrak, MARC and VRE commuter rail services, the Washington Metro, and buses. It opened in 1907 and at its height during World War II some 200,000 people passed through it every day. It is also the headquarters for Amtrak.