Core Viewpoint - The successful completion of the Nanjing South Tunnel shield section marks a significant milestone in the expansion and renovation of the Nanjing-Wuhu Railway, which is crucial for enhancing freight capacity along the eastern section of the Yangtze River Economic Belt [1] Group 1: Project Details - The Nanjing South Tunnel shield section is approximately 2.4 kilometers long and has successfully passed under complex geological areas and dense surface buildings, utilizing "micro-disturbance excavation + precise guidance" technology to ensure safe construction [1] - The expansion project involves relocating the railway route from the city center of Nanjing to the urban outskirts, which includes the construction of key nodes such as the Nanjing South Tunnel [1] Group 2: Economic Impact - The Nanjing-Wuhu Railway primarily focuses on freight transport while also accommodating passenger services, serving as an important infrastructure for improving freight capacity in the eastern section of the Yangtze River Economic Belt [1] - The completion of the expansion and renovation will further optimize the regional railway network layout and assist in the upgrading and adjustment of the industrial structure in the surrounding areas [1]