The remaining segment of K6's original routing to Metro Center in Downtown Washington D.C., via on New Hampshire Avenue NW, Park Road NW (to Farrugut Square), Monroe Street NW (to White Oak), 11th Street NW, F Street NW, 12th Street NW, G Street NW, & 11th Street NW, was completely taken over/replaced by WMATA's brand new K4 Metrobus Route, which was designed to operate between the Fort Totten Metro Station & Metro Center in Downtown Washington D.C.