Core Points - The Beijing Subway Line 13 expansion project has officially named the 13A line as Line 18 [1] - Line 17 will connect with Line 18 at Tiantongyuan East Station, which is scheduled to open in December 2025 [1] - The completion of the cold and hot sliding tests at the Xiaoxin Zhuang parking lot indicates that Lines 13 and 18 will form an "X" shaped route, enhancing travel convenience for residents in Haidian, Changping, and Chaoyang districts [1] - The integration of Lines 1 to 19 will be fully completed with this development [1]