According to the June 2010 plans, the northern section of Line 16 will replace the originally planned Line 4 northern extension and run from Beianhe in Haidian District south to Xiaoyueyuan near the Marco Polo Bridge in Fengtai District. The line would begin near Beianhe, and provide access to parts of Haidian, north of the foothills the Western Hills that extend into district. For this reason, that section of the line was also referred to as the Haidian Shanhou (literal translation Haidian Back Mountain) Line because it begins on the backside of the low-lying range that extends from the Fragrant Hills to the Summer Palace. Points of interest that the line may pass along route to Xiaoyueyuan in the south include the Summer Palace, Haidian Gymnasium, National Library, Purple Bamboo Park, Beijing Zoo, Chegongzhuang West Road, Sanlihe, Wanshou Temple, Lize Business District, and the Fengtai railway station. The proposal was scaled back with the removal of the Haidian Shanhou section in December 2010, reducing the line to just , from Suzhoujie to Wanping. But the northern section was subsequently restored months later, bringing the line length .