A drone image shows the construction site of the Wuhan-Yichang section of the Shanghai-Chongqing-Chengdu high-speed railway in Hubei province. The 313-kilometer section, which is being built by the 24th bureau of State-owned infrastructure builder China Railway Construction Corp as a critical part of the national major horizontal rail network, has had its ballastless track completed — another major milestone ahead of its expected operation next year.