城市轨交年底集中开通，地铁建设审批收紧

Core Viewpoint - The expansion of urban rail transit construction is expected to slow down in the future, with stricter approval standards being implemented by the National Development and Reform Commission (NDRC) [1][5][8] Group 1: Recent Developments in Urban Rail Transit - Chengdu's Metro Line 13 and Line 30 are set to open on December 16, increasing the total operational mileage of Chengdu's rail transit to over 750 kilometers, ranking it fourth in the country [1][2] - In 2025, Chengdu's operational mileage is projected to reach 719.53 kilometers after the addition of 57.03 kilometers from the new lines [2] - Multiple cities, including Shenzhen and Nanjing, are also set to open new rail lines, with Shenzhen's operational mileage expected to reach 635 kilometers and Nanjing's to 524.4 kilometers by the end of the year [3][4] Group 2: Historical Context and Comparisons - The operational mileage of Chengdu has increased by 161.73 kilometers since 2020, while Guangzhou and Shenzhen have seen increases of 207.9 kilometers and 212.4 kilometers, respectively [4] - By the end of this year, nine cities will have operational rail transit mileage exceeding 500 kilometers, with Beijing and Shanghai leading at over 800 kilometers [3][4] Group 3: Future Challenges and Regulatory Changes - Future urban rail transit construction is likely to face reduced expansion speed and scale due to increased scrutiny and stricter approval conditions set by the NDRC [5][7][8] - The NDRC's new guidelines require cities to meet specific financial and demographic criteria to qualify for rail transit construction approvals, which may hinder many cities from advancing their projects [6][8] - Only Chengdu has received approval for a new phase of rail transit construction in 2024, while over ten cities are currently awaiting approval for their new plans [7][8]