 The extension would serve Fort Mason Center and the Marina district, identified by the NPS as areas with "inadequate regional transit access" and "limited transportation options for transit-dependent residents," and providing those areas with a rail connection to regional transportation networks via the Market Street subway and 4th and King Caltrain Station.Though the right-of-way is shared with the two Muni Metro lines on the South of Market segment, the stations themselves are not shared with Muni Metro because historic cars cannot access elevated median boarding platforms.For this reason, existing sidewalk-level stops adjacent to each raised light-rail stop are utilized for the E line.