城市轨交年底集中开通，地铁建设审批收紧

Core Viewpoint - The article discusses the recent surge in urban rail transit construction in various cities in China, particularly highlighting the opening of new lines in Chengdu and other cities, while also indicating a potential slowdown in future expansion due to stricter approval standards from the government [3][10]. Summary by Sections Recent Openings - Chengdu's Metro Line 13 and Line 30 are set to officially open on December 16, 2025, increasing the city's total rail transit mileage to over 750 kilometers, ranking it fourth nationally [3][5]. - In addition to Chengdu, multiple cities, including Shenzhen and Nanjing, are also set to open new metro lines, contributing to a significant increase in their operational rail lengths [7][8]. Operational Data - By the end of 2025, cities with operational rail transit exceeding 500 kilometers will reach nine, with Beijing and Shanghai leading at over 800 kilometers [8]. - Chengdu's rail transit mileage has increased by 161.73 kilometers since 2020, while Guangzhou and Shenzhen have seen even larger increases of 207.9 kilometers and 212.4 kilometers, respectively [8]. Future Construction Trends - Future urban rail transit construction is expected to slow down, with stricter approval processes in place. For instance, Ningbo's plans for new rail lines are currently on hold due to insufficient passenger flow [10][12]. - The National Development and Reform Commission has implemented higher standards for new rail transit project approvals, which may affect previously approved but unimplemented projects [13]. Approval Standards - New guidelines stipulate that cities must meet specific financial and demographic criteria to qualify for rail transit project approvals, including a minimum public budget income of 300 billion yuan and a GDP of 3 trillion yuan [11]. - As of November, only 18 out of 54 cities with operational rail transit met the required passenger flow standards, indicating a broader issue with meeting the new approval criteria [12].