The Blue and Orange Lines remain co-aligned from Rosslyn to Stadium - Armory and the Silver Line is co-signed along the same route as well .
Beginning December 1 , 1979 , the Orange Line diverged westward from Rosslyn to Ballston .
The Blue and Orange Line   remain co-aligned from Rosslyn to Stadium - Armory and the Silver Line is co-signed along the same route as well .
Beginning December 1 , 1979 , the Orange Line diverged westward from Rosslyn to Ballston .