Core Points - By the end of 2024, Beijing will have 29 operational subway lines, totaling 879 kilometers in length and featuring 522 stations, including 98 transfer stations [1] - The first subway line, Line 1, was opened on October 1, 1969, and the network has expanded significantly over the past 55 years [1][2] - The 3rd and 12th subway lines are set to open on December 15, 2024, marking the addition of the 28th and 29th lines to the network [1][30][31] - The 18th line, a result of the expansion of Line 13, is expected to open by the end of this year, bringing the total to 30 lines [1] Summary by Line - **Line 1**: Opened on October 1, 1969, initially not open to the public until January 15, 1971, and officially operational on September 15, 1981 [2] - **Line 2**: Opened on September 20, 1984, as the first circular subway line in China [3] - **Line 13**: Opened its western section on September 28, 2002, and the eastern section on January 28, 2003 [4] - **Line 5**: Fully operational since October 7, 2007, serving as a major north-south transit line [6] - **Line 10**: Opened on July 19, 2008, and is currently the busiest line in the system [7] - **Capital Airport Line**: Opened on July 19, 2008, connecting the city to the international airport [9] - **Line 8**: Opened to the public on October 9, 2008, after initially serving the Olympics [10] - **Line 4**: Opened on September 28, 2009, and is operated by the MTR Corporation [11] - **Daxing Line**: Opened on December 30, 2010, and connects with Line 4 [12] - **Yizhuang Line**: Opened on December 30, 2010, with further extensions in subsequent years [13] - **Fangshan Line**: Opened its first section on December 30, 2010, with additional sections opened in later years [14] - **Changping Line**: Opened on December 30, 2010, and has seen multiple extensions since [15] - **Line 15**: Opened its first section on December 30, 2010, with further expansions in 2011 and 2014 [16] - **Line 9**: Opened its southern section on December 31, 2011, with further extensions in subsequent years [17] - **Line 6**: Opened on December 30, 2012, with additional sections opened in 2014 and 2018 [18] - **Line 14**: Opened its western section on May 5, 2013, with further expansions in the following years [19] - **Line 7**: Opened on December 28, 2014, and has been extended to serve new areas [20] - **Line 16**: Opened its northern section on December 31, 2016, with ongoing expansions planned [21] - **Xijiao Line**: Opened on December 30, 2017, connecting various parks and attractions [22] - **S1 Line**: Opened its first section on December 30, 2017, and completed the remaining section in 2021 [23] - **Yanqing Line**: Opened on December 30, 2017, as the first fully automated subway line in China [24] - **Daxing Airport Line**: Opened on September 26, 2019, serving the new airport [25] - **Yizhuang T1 Line**: Opened on December 31, 2020, with separate ticketing [26] - **Line 17**: Opened its southern section on December 31, 2021, with plans for full connectivity by 2025 [27] - **Line 19**: Opened its first section on December 31, 2021, with additional stations opened in July 2022 [28] - **Line 11**: Opened its western section on December 31, 2021, with further sections planned for December 2023 [29] - **Line 3**: Scheduled to open on December 15, 2024, completing its first phase [30] - **Line 12**: Also set to open on December 15, 2024, primarily running along the North Third Ring Road [31]

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]