Question: The Virginia Rail Express and the Washington Union Station both operate in this city.

Context paragraphs:
Washington Union Station: 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.  The station also serves MARC and VRE commuter rail services, the Washington Metro subway, intercity bus lines, and local Metrobus buses.

First Street Tunnel: The First Street Tunnel is a two-track, soft-earth tunnel built between 1904 and 1906 by the Washington Terminal Company to serve as the southern approach to Union Station in Washington, D.C. Currently owned by Amtrak, it connects to lower-level tracks and platforms at the station, passes under Capitol Hill and connects to the RF&P Subdivision (CSX Transportation) and Long Bridge, offering through railway service to Alexandria, Virginia, and points west and south.  Unlike the Northeast Corridor tracks north of Union Station, the tunnel tracks are not electrified, so southbound trains leaving Union Station must switch to diesel locomotives before entering the tunnel.  Exiting Union Station, the tunnel runs due south under First Street NE and SE before curving to the southwest under a parking lot near the Capitol South Metro station.  Its southern portal is just east of South Capitol Street at the intersection of D Street SE and New Jersey Avenue SE.

Dallas Union Station: Dallas Union Station, officially Eddie Bernice Johnson Union Station, also known as Dallas Union Terminal, is a railroad station in Dallas, Texas.  It serves DART Light Rail, Trinity Railway Express commuter rail, and Amtrak intercity rail.  It is located on Houston Street, between Wood and Young Streets, in the Reunion district of Downtown Dallas.  The structure is a Dallas Landmark and is listed on the National Register of Historic Places.

Union Station (New Haven): Union Station, also known as New Haven Railroad Station (IATA: ZVE) or simply New Haven, is the main railroad passenger station in New Haven, Connecticut.  Designed by noted American architect Cass Gilbert, the beaux-arts Union Station was completed and opened in 1920 after the previous Union Station (which was located at the foot of Meadow Street, near the site of the current Union Station parking garage) was destroyed by fire.  It served the New York, New Haven and Hartford Railroad until it fell into decline, along with the rest of the railroad industry in North America after World War II.  It was shuttered in 1972, leaving only the under-track 'subway' open for passengers, and listed on the National Register of Historic Places on September 3, 1975, but it was almost demolished before the Northeast Corridor Improvement Project came to the rescue in 1979.  Reopened after extensive renovations in early 1985, it is now the premier gateway to the city.

Union Station (Seattle): 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.  Located at the corner of S. Jackson Street and 4th Avenue S. in the Pioneer Square neighborhood, the station opened on May 20, 1911.  The Milwaukee Road discontinued passenger service to Union Station 50 years later, on May 22, 1961, and the Union Pacific followed suit on April 30, 1971.  With no passenger rail service serving Seattle from Union Station, the building remained largely empty.  After nearly 30 years of sitting idle, the station finally experienced an expansive renovation supported by Nitze-Stagen with financial backing from Paul Allen.  The Union Station renovation was the winner of the 2000 National Historic Preservation Award.  It now serves as the headquarters of Sound Transit; its grand hall is rented out to the public for weddings and other events.

Virginia Railway Express: The Virginia Railway Express (VRE) (reporting mark VREX) is a regional/commuter rail service that connects the Northern Virginia suburbs to Union Station in Washington, D.C., via two lines: the Fredericksburg Line from Fredericksburg, Virginia, and the Manassas Line from Broad Run/Airport station in Bristow, Virginia.

New London Union Station: New London Union Station is a historic regional rail station located in New London, Connecticut, United States.  Located on the Northeast Corridor, the busiest railway in the United States, it is the primary railroad station in southeastern Connecticut.  Union Station is a station stop for most of Amtrak's "Northeast Regional" trains and a small number of high-speed "Acela Express" trains.  Certain CDOT Shore Line East commuter rail trains also stop at New London, making it the eastern terminus of commuter rail in Connecticut.

Rail Express Systems: Rail Express Systems was a sector of British Rail.  Upon the sectorisation of British Rail during the 1980s, the Parcels Sector was created.  In 1991, this was re-branded as Rail Express Systems.

Washington Union High School: Washington Union High School is a high school in the rural community of Easton in Fresno County, California.  Founded in 1892 (and first accredited in 1965), Washington Union is most likely the second oldest high school in Fresno County (Fresno High School being established three years earlier in 1889).  The school encompasses roughly 90-square miles in the heart of the central San Joaquin Valley.  The mascot for Washington Union is the Panthers, with school colors being purple, white, grey, and black.  The school has a large and diverse population of students from the Fresno metropolitan area.

Alexandria Union Station: 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.

Supporting paragraphs: Virginia Railway Express Washington Union Station
Answer: Washington, D.C.