Yes, the nearest station is Washington, DC UNION STATION if you are registering on amtrak.com's website its WAS
When you get to Union Station, take the Metro (the DC Subway system)
1. From the Union Station Stop, take the Red Line toward Shady Grove.
2. Get off at the Gallery Place ChinaTown Stop. and Switch to the Yellow Line towards Huntington.
3. Get off at the Crystal City stop.
If you would like a map of the Washington DC Metro (subway) system. Go to http://www.wmata.com/metrorail/systemmap.cfm
Hope this help.