南京这7条在建地铁线路进展来啦！

Group 1 - The construction of seven metro lines in Nanjing has made significant progress as of the end of December [1][3] - The second phase of Line 4 has commenced construction on four stations and a central ventilation shaft, with three stations and a shaft having completed their main structure [1] - For Line 6, project acceptance has been achieved, and it is currently undergoing non-passenger test runs [1] Group 2 - The first phase of Line 9 has completed all main structures, with auxiliary structure construction ongoing [3] - A total of 31 shield tunnels have started, with 30 of them already completed [3] - The first phase of Line 11 has seen 18 stations commence construction, with 17 stations having completed their main structures [3] Group 3 - The Ningma Line has passed project acceptance and is currently in non-passenger test runs [3] - The Ningchao Line (Nanjing section) is advancing preliminary construction preparations for the underground section, while the elevated section is progressing with civil engineering [3] - The Ningyang Line (Nanjing section) has three stations and three elevated sections under construction, with two stations having completed protective structures and one station completing its main structure [3]