From UNION STATION MARC Washington train to FREDERICK MARC wb then taxi to Gettysburg. 2 h 24 min $121. From Washington drive to Gettysburg. 1 h 36 min $9. From Washington Union Station Amtrak train to BWI Amtrak/MARC Station, bus to Baltimore airport, fly to Hagerstown airport, then taxi to Gettysburg. 3 h 3 min $264.