system in Northern Virginia
, terminating at Union Station
VRE has two lines, the Manassas Line and the Fredericksburg Line, starting at Manassas and Fredericksburg, Virginia (what a shock, it actually makes sense). Most trains run toward DC in the morning and away from DC in the evening, but a couple trains per cycle run in reverse to take reverse commuters from the city to their jobs in the suburbs.
There has been much talk about extending the Fredericksburg line further down I-95 to Richmond, but no real action yet.