The Blue Line separates from the Yellow Line in this tunnel .
The Blue Line emerges on surface tracks that parallel Virginia Route 110 before entering a tunnel south of Rosslyn , where it merges with the Orange Line and Silver Line .
The Blue Line separates from the Yellow Line in this tunnel and emerges on surface tracks that parallel Virginia Route 110 before entering a tunnel south of Rosslyn , where it merges with the Orange Line and Silver Line .