# Concepts



- [Line 18 (Shanghai Metro)](/en/concepts/shanghai-metro-line-18.html)：Line 18 (Shanghai Metro) is a metro line, opened on 26 December 2020, 44.815 km long, with 31 stations.
- [Line 2 (Nantong Rail Transit)](/en/concepts/nantong-metro-line-2.html)：Line 2 (Nantong Rail Transit) is a metro line, opened on 27 December 2023, with 17 stations.
- [Changping line](/en/concepts/beijing-metro-line-ditiechangpingxian.html)：Changping line is a metro line, opened on 30 December 2010, 44 km long, with 20 stations.
- [Line 13 (Dalian Metro)](/en/concepts/dalian-metro-line-13.html)：Line 13 (Dalian Metro) is a metro line, opened on 28 December 2021, 43.15 km long, with 11 stations.
- [Line 2 (Qingdao Metro)](/en/concepts/qingdao-metro-line-2.html)：Line 2 (Qingdao Metro) is a metro line, opened on 10 December 2017, 24.39 km long, with 25 stations.
- [Line 8 (Hefei Metro)](/en/concepts/hefei-metro-line-8.html)：Line 8 (Hefei Metro) is a metro line, opened on 26 December 2024, with 12 stations.
- [长春地铁8号线](/en/concepts/changchun-metro-line-8.html)：长春地铁8号线是一条地铁线路，设有12座车站。
- [Line 9 (Tianjin Metro)](/en/concepts/tianjin-metro-line-9.html)：Line 9 (Tianjin Metro) is a metro line, opened on 30 September 2003, 52.759 km long, with 21 stations.
- [Line 10 (Shanghai Metro)](/en/concepts/shanghai-metro-line-10.html)：Line 10 (Shanghai Metro) is a metro line, opened on 10 April 2010, 46.311 km long, with 37 stations.
- [Line 4 (Qingdao Metro)](/en/concepts/qingdao-metro-line-4.html)：Line 4 (Qingdao Metro) is a metro line, with 25 stations.
- [Line 1 (Qingdao Metro)](/en/concepts/qingdao-metro-line-1.html)：Line 1 (Qingdao Metro) is a metro line, 42.36 km long, with 41 stations.
- [Line 5 (Suzhou Metro)](/en/concepts/suzhou-metro-line-5.html)：Line 5 (Suzhou Metro) is a metro line, with 34 stations.
- [Line 3 (Qingdao Metro)](/en/concepts/qingdao-metro-line-3.html)：Line 3 (Qingdao Metro) is a metro line, opened on 16 December 2015, with 22 stations.
- [Line 7 (Shanghai Metro)](/en/concepts/shanghai-metro-line-7.html)：Line 7 (Shanghai Metro) is a metro line, opened on 5 December 2009, 44.366 km long, with 33 stations.
- [Line 3 (Shanghai Metro)](/en/concepts/shanghai-metro-line-3.html)：Line 3 (Shanghai Metro) is a metro line, opened on 26 December 2000, 40.34 km long, with 29 stations.
- [Line 8 (Shanghai Metro)](/en/concepts/shanghai-metro-line-8.html)：Line 8 (Shanghai Metro) is a metro line, opened on 29 December 2007, 37.5 km long, with 30 stations.
- [Line 14 (Shanghai Metro)](/en/concepts/shanghai-metro-line-14.html)：Line 14 (Shanghai Metro) is a metro line, opened on 30 December 2021, 38.514 km long, with 30 stations.
- [Line 15 (Shanghai Metro)](/en/concepts/shanghai-metro-line-15.html)：Line 15 (Shanghai Metro) is a metro line, opened on 23 January 2021, 42.3 km long, with 30 stations.
- [Line 12 (Dalian Metro)](/en/concepts/dalian-metro-line-12.html)：Line 12 (Dalian Metro) is a metro line, opened on 1 May 2014, 40.35 km long, with 8 stations.
- [Beijing Yizhuang T1 Line](/en/concepts/beijing-metro-line-yizhuangt1xian.html)：The Beijing Yizhuang T1 Line is a metro line with 14 stations.
- [Line 2 (Nanning Metro)](/en/concepts/nanning-metro-line-2.html)：Line 2 (Nanning Metro) is a metro line, opened on 28 December 2017.
- [Line 3 (Nanning Metro)](/en/concepts/nanning-metro-line-3.html)：Line 3 (Nanning Metro) is a metro line, opened on 6 June 2019, with 23 stations.
- [Line 2 (Taiyuan Metro)](/en/concepts/taiyuan-metro-line-2.html)：Line 2 (Taiyuan Metro) is a metro line, opened on 26 December 2020, 23.647 km long, with 23 stations.
- [长春地铁5号线](/en/concepts/changchun-metro-line-5.html)：长春轨道交通5号线一期连接卓越大街与东大桥，于2026年9月28日开通运营。
- [东莞地铁1号线](/en/concepts/dongguan-metro-line-1.html)：东莞地铁1号线连接东莞西站与梅塘站，2025年11月28日开通运营。
- [Line 1 (Fuzhou Metro)](/en/concepts/fuzhou-metro-line-1.html)：Line 1 (Fuzhou Metro) is a metro line, opened on 18 May 2016, 24.89 km long, with 25 stations.
- [Zhili (Ming dynasty)](/en/concepts/cnhist-ming-zhili.html)：Zhili (Ming dynasty): areas of prefectures directly administered by the capital in the Ming dynasty.
- [Beijing Metro Line 4 / Daxing Line](/en/concepts/beijing-metro-line-4.html)：Beijing Metro Line 4 / Daxing Line is a north–south through-operating line connecting Anheqiaobei Station with Tiangongyuan Station, operated by Beijing MTR.
- [Chuzhou Metro Line S4](/en/concepts/chuzhou-metro-line-dities4haoxian.html)：The Chuzhou–Nanjing Intercity Railway connects Chuzhou with Nanjing; the Chuzhou section began initial operations in 2023, and the subsequent status of the Nanjing section is subject to announcements.
- [Line 16 (Beijing Subway)](/en/concepts/beijing-metro-line-16.html)：Line 16 (Beijing Subway) is a metro line, opened on 31 December 2016, 48.9 km long.
- [Line 11 (Shanghai Metro)](/en/concepts/shanghai-metro-line-11.html)：Line 11 (Shanghai Metro) is a metro line, opened on 31 December 2009, 82.386 km long, with 40 stations.
- [Line 1 (Tianjin Metro)](/en/concepts/tianjin-metro-line-1.html)：Line 1 (Tianjin Metro) is a metro line, opened on 28 December 1984, 42.227 km long, with 29 stations.
- [Line 2 (Beijing Subway)](/en/concepts/beijing-metro-line-2.html)：Line 2 (Beijing Subway) is a loop metro line, opened on 15 January 1971, 23.1 km long, with 18 stations.
- [Line 2 (Dongguan Rail Transit)](/en/concepts/dongguan-metro-line-2.html)：Line 2 (Dongguan Rail Transit) is a metro line, opened on 27 May 2016, 37.8 km long, with 15 stations.
- [Changchun Metro Line 6](/en/concepts/changchun-metro-line-6.html)：Changchun Metro Line 6 is a rail transit line connecting the east and west of southern Changchun. It opened on 28 March 2024.
- [Changchun Metro Line 3](/en/concepts/changchun-metro-line-3.html)：Changchun Metro Line 3 is a metro line with 34 stations.
- [Line 10 (Beijing Subway)](/en/concepts/beijing-metro-line-10.html)：Line 10 (Beijing Subway) is a loop metro line, opened on 19 July 2008, 57.1 km long, with 45 stations.
- [太原地铁1号线](/en/concepts/taiyuan-metro-line-1.html)：太原地铁1号线一期连接河龙湾与武宿1号2号航站楼，于2025年2月22日开通初期运营。
- [Beijing Metro Line 1 / Batong Line](/en/concepts/beijing-metro-line-1.html)：Beijing Metro Line 1 / Batong Line is an east–west metro operating line connecting Shijingshan District and Tongzhou District in Beijing, operated as a through service of Line 1 and the Batong Line.
- [Paris Métro Line 7bis branch](/en/concepts/paris-metro-line-7bis.html)：The Line 7bis branch (7bis) is a short line between Louis Blanc and Pré Saint-Gervais, located in the northeast of Paris.
- [Loop line (Chongqing Rail Transit)](/en/concepts/chongqing-metro-line-guidaojiaotonghuanxian.html)：Loop line (Chongqing Rail Transit) is a loop metro line, opened on 28 December 2018, with 33 stations.
- [Chongqing Bitong Line](/en/concepts/chongqing-metro-line-bitongxian.html)：CPTOND-2025’s Chongqing rail-route dataset lists the Bitong Line and records nine stations in the direction from Dalu to Qinglonghu.
- [Line 8 (Qingdao Metro)](/en/concepts/qingdao-metro-line-8.html)：Line 8 (Qingdao Metro) is a metro line, with 18 stations.
- [Chengxuan buzhengshisi (Ming dynasty)](/en/concepts/cnhist-ming-buzhengshisi.html)：Chengxuan buzhengshisi (Ming dynasty): provincial-level divisions of the Ming dynasty that replaced the xingsheng.
- [Line 6 (Beijing Subway)](/en/concepts/beijing-metro-line-6.html)：Line 6 (Beijing Subway) is a metro line, opened on 30 December 2012, 55.752 km long, with 36 stations.
- [Xingsheng (Yuan dynasty)](/en/concepts/cnhist-yuan-xingsheng.html)：Xingsheng (Yuan dynasty): branch secretariats of the Yuan Central Secretariat and their territories, the origin of provinces.
- [Line 1 (Luoyang Subway)](/en/concepts/luoyang-metro-line-1.html)：Line 1 (Luoyang Subway) is a metro line, opened on 28 March 2021, with 19 stations.
- [Paris Metro Line 3 Branch Line](/en/concepts/paris-metro-line-3bis.html)：Line 3 Branch (3bis) is a short line 1.3 kilometers long between Gambetta and Porte des Lilas, established in 1971.
- [Line 7 (Beijing Subway)](/en/concepts/beijing-metro-line-7.html)：Line 7 (Beijing Subway) is a metro line, opened on 28 December 2014, 23.7 km long, with 30 stations.
- [Line S1 (Beijing Subway)](/en/concepts/beijing-metro-line-s1xian.html)：Line S1 (Beijing Subway) is a metro line, opened on 30 December 2017, 10.2 km long, with 8 stations.

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