The Nanjing South Railway Station (Chinese: 南京南站) (IATA: NKJ) is a high-speed railway station in Nanjing, Jiangsu, People's Republic of China, serving the Jinghu High-Speed Railway, Huning Intercity Rail, Ninghang Passenger Railway and the Huhanrong (Shanghai–Wuhan–Chengdu) Railways. The New Nanjing South Railway Station station is located a few kilometres south of downtown Nanjing. The station's construction site is already connected with the central Nanjing by Line 1, Line 3 and Line S1 of Nanjing Metro. According to CCTV, it is the world's second largest railway station in terms of GFA (Gross Floor Area) at 458,000 square metre (4,929,871 square ft). The dimension of the main roof is 456m x 216m (excluding smaller roof on both sides of the main roof), the main roof is constructed with steel weighing more than 8000 tons. The roof on top of the waiting hall area (part of the main roof) is 72,000 square meter (775,001 square ft). The entire railway station has 128 escalators, and 28 platforms (a combination of island-platforms and side-platforms). At the peak of the construction phase, there were more than 20,000 construction workers and engineers at work.