重大进展！我国自主研制，突破万米大关！

Core Viewpoint - The successful breakthrough of the "Linghao" shield machine at the Chongtai Yangtze River Tunnel marks a significant step towards achieving a high-speed rail connection across the Yangtze River, with a target speed of 350 km/h [1][3] Group 1: Project Details - The "Linghao" shield machine is approximately 148 meters long, weighs about 4,000 tons, and features a 15.4-meter diameter cutter head, showcasing advanced autonomous capabilities for intelligent tunneling [3] - The Chongtai Yangtze River Tunnel is a critical component of China's "eight vertical and eight horizontal" high-speed rail network, connecting Chongming District in Shanghai with Taicang City in Jiangsu Province [3] - The total length of the tunnel is 14.25 kilometers, with the shield section measuring 13.201 kilometers, making it the largest and highest standard high-speed rail underwater tunnel project globally [3] Group 2: Economic Impact - Upon completion, the tunnel will significantly reduce travel time between cities along the Yangtze River, enhancing connectivity for cities like Shanghai, Nanjing, and Hefei [3] - The project is expected to play a vital role in the development of the "Railway on the Yangtze River Delta," contributing to the high-quality growth of the Yangtze River Economic Belt [3]