Amtrak's headquarters provides service to which two rail lines in Virginia?
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. 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 Fredericksburg Line from Fredericksburg, Virginia, and the Manassas Line