Core Viewpoint - The construction of the Chengdu-Chongqing high-speed railway, set to open in 2027 with a speed of 400 km/h, is expected to significantly enhance connectivity between the two cities, creating a one-hour economic circle and marking a milestone in China's high-speed rail technology [4][10][12]. Group 1: High-Speed Rail Development - The Chengdu-Chongqing high-speed railway will operate at a speed of 400 km/h, making it the fastest high-speed rail in the world upon completion [5][10]. - Currently, there are two operational high-speed rail lines between Chongqing and Chengdu, with travel times ranging from over one hour to two hours [7][8]. - The new line will reduce travel time to approximately 50 minutes, enhancing the daily passenger flow, which currently exceeds one million trips [3][8][10]. Group 2: Strategic Importance - The Chengdu-Chongqing area is positioned as a key economic zone in China's domestic circulation strategy, enhancing its strategic and economic significance [14]. - The establishment of the Chengdu-Chongqing economic circle has been recognized as a national strategy, aiming to accelerate regional integration and connectivity [14][16]. - The high-speed railway is part of the broader "Eight Vertical and Eight Horizontal" high-speed rail network, emphasizing its importance in national infrastructure [10][12]. Group 3: Technological and Economic Implications - The successful implementation of the 400 km/h high-speed rail is expected to set a global standard for high-speed rail technology, potentially opening new markets for China's high-speed rail exports [17][18]. - The railway's construction is supported by advanced technology and favorable geographical conditions, which are crucial for achieving high operational speeds [11][12]. - The increase in high-speed rail mileage in the Sichuan-Chongqing region reflects a significant improvement in regional transportation infrastructure, with Chongqing's operational high-speed rail mileage projected to reach 1,170 km by the end of 2024 [24].