The Rush+ realignment was intended to free up space in the Rosslyn Portal (the tunnel between Rosslyn and Foggy Bottom), which operates at full capacity already. When Silver Line service began, those trains would be routed through the tunnel, and so some of what were Blue Line trains to were now diverted across the Fenwick Bridge to become Yellow Line trains running all the way to the Green Line to . Select Yellow Line trains running south diverted along the Blue Line to (as opposed to the normal Yellow line terminus at ). Until the start of Silver Line service, excess Rosslyn Tunnel capacity was used by additional Orange Line trains that traveled along the Blue Line to Largo (as opposed to the normal Orange Line terminus at ). Rush+ had the additional effect of giving some further number of passengers transfer-free journeys, though severely increasing headways for the portion of the Blue Line running between and . In May 2017, Metro announced that Yellow Rush+ service would be eliminated effective June 25, 2017.