海河上第一条高铁隧道津沽海河隧道贯通

Core Viewpoint - The successful completion of the Tianjin-Weifang high-speed railway's key control project, the Tianjin Gu Hai River Tunnel, lays a solid foundation for the timely operation of the entire railway line [1] Group 1: Project Overview - The Tianjin-Weifang high-speed railway connects to the Beijing-Tianjin intercity railway in the north and the Jiqing high-speed railway in the south [1] - The total length of the main line is 348.9 kilometers, with a designed speed of 350 kilometers per hour [1] Group 2: Tunnel Specifics - The Tianjin Gu Hai River Tunnel's shield section is approximately 6.5 kilometers long, making it the only tunnel along the Tianjin-Weifang high-speed railway [1] - It is also noted as the first high-speed railway tunnel over the Hai River [1]