Title: Union Station (DC Streetcar)
Content:  Union Station is a streetcar station, located on H Street NE in the middle of the Hopscotch Bridge. It is located on the H Street/Benning Road Line of the DC Streetcar system.
Title: Union Station (Washington Metro)
Content:  Union Station is a Washington Metro station in Washington, D.C. on the Red Line. It has a single underground island platform. The station is located in the Northeast quadrant of the city under the western end of Union Station, the main train station for Washington, where connections can be made to Amtrak intercity trains, as well as Virginia Railway Express and MARC commuter rail trains to suburbs in Virginia, Maryland, and West Virginia. The station was originally named "Union Station&ndash;Visitor Center" but when the National Visitor Center there failed, it was renamed Union Station. One or two pylons still read "Union Station-Visitor Center", and a number of older stations still display this name on signage. Service began on March 27, 1976 with the opening of the Red Line. It is the busiest station in the Metrorail system, averaging 29,197 passengers per weekday as of May 2017.
Title: Washington Union Station
Content:  Washington Union Station is a major train station, transportation hub, and leisure destination in Washington, D.C. Opened in 1907, it is Amtrak's headquarters and the railroad's second-busiest station with annual ridership of just under 5 million and the ninth-busiest in overall passengers served in the United States. 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. An intermodal facility, Union Station also serves MARC and VRE commuter rail services, the Washington Metro, the DC Streetcar, intercity bus lines, and local Metrobus buses. At the height of its traffic, during World War II, as many as 200,000 passengers passed through the station in a single day. In 1988, a headhouse wing was added and the original station renovated for use as a shopping mall. Today, Union Station is one of the busiest rail facilities and shopping destinations in the United States, and is visited by over 40 million people a year.
Title: Union Station (Seattle)
Content:  Union Station is a former train station in Seattle, Washington, United States, constructed between 1910 and 1911 to serve the Union Pacific Railroad and the Milwaukee Road. It was originally named Oregon and Washington Station, after a subsidiary line of the Union Pacific. It serves today as the headquarters of Sound Transit, the public transit agency serving the city and metro area.
Title: Union Station (Tacoma, Washington)
Content:  The Union Passenger Station in Tacoma, Washington, United States, opened in 1911. It was listed on the National Register of Historic Places in 1974. It currently serves as a courthouse of the United States District Court for the Western District of Washington. The distinctive architecture, dominated by a copper dome, is a landmark for the area.
Title: Union Station (Worcester, Massachusetts)
Content:  Union Station is a railway station located at Washington Square in downtown Worcester, Massachusetts. It is the western terminus of the Massachusetts Bay Transportation Authority's Framingham/Worcester commuter rail line, with inbound service to Boston, and a station along Amtrak's Lake Shore Limited passenger line. It also services Peter Pan and Greyhound intercity bus routes and acts as a hub for the local Worcester Regional Transit Authority (WRTA) bus service.
Title: Union Station (Winston-Salem, North Carolina)
Content:   Union Station, also known as Davis Garage, is a historic train station located at Winston-Salem, Forsyth County, North Carolina. It was designed by Fellhimer & Wagner and built between 1924 and 1926. It is a one- to three-story, banked Beaux-Arts style steel frame building faced with brick and limestone. It consists of a rectangular main body, five bays wide and eight bays deep, with a large square east wing. The front facade features a limestone portico supported by paired heroic columns with stylized Corinthian order capitals. Surrounding the building are some surviving original landscape features. The station served as the city's sole passenger train station between 1926 and 1970. It was listed on the National Register of Historic Places in 1998.
Title: Union Station/South 19th Street station
Content: The outline of a ship's frame and American Indian fishing tools in the median by the station ; Roof of the station platform is meant to look like the ribs of a ship ; Photos and poems covering manufacturing and fishing in the area on the platform Union Station/South 19th Street is a light rail station on Link light rail's Line T in Tacoma, Washington, United States. The station officially opened for service on August 22, 2003, and serves the University of Washington, Tacoma, a variety of museums, government buildings, and apartment complexes. The station is named after the nearby and much larger Tacoma Union Station, which now serves as a courthouse. It is located near the University of Washington, Tacoma campus, Museum of Glass, Washington State History Museum, and Tacoma Art Museum. Union Station also serves as the main entryway to the Tall Ships Festival on the nearby Thea Foss Waterway. Artwork at the station reflects the area's American Indian culture, and the manufacturing and shipbuilding that took place in the vicinity (including in many of the buildings used by UW Tacoma). Artwork includes:
Title: Union Station (Columbia, South Carolina)
Content:  Union Station (originally Union Depot), also known as Atlantic Coast Line Railroad and Southern Railway Station, is a historic train station located at Columbia, South Carolina. It was built in 1902, and is a brick and stone, eclectic Jacobethan Revival / Tudor Revival building. It features stepped gables and towering chimneys. It was designed by architect Frank Pierce Milburn for the Atlantic Coast Line Railroad and Southern Railway. In contrast to the custom of 'union station' denoting the single station for several railroads, the Seaboard Air Line Railroad had its own station one-half mile away. The formerly Seaboard Silver Star still operates through another station in Columbia.
Title: Portland Union Station
Content:  Union station is situated near the western bank of the Willamette River in downtown Portland's Old Town Chinatown. The site is bound by Northwest Glisan, Hoyt, and Irving streets to the south; Northwest Broadway Street and Station Way to the west; Northwest Overton Street and Naito Parkway to the north; and Northwest Ironside Terrace and industrial and commercial zones to the east.

Question: where is union station in washington dc located?
Answer: 50 Massachusetts Avenue NE.