Logistics workers load a 35-metric-ton container of metallurgical coke onto a rail freight wagon at a logistics park in the Inner Mongolia autonomous region. The unit train, with a maximum capacity of 100 equivalent containers, will travel via the Datong-Juungar Railway to connect with the Datong-Qinhuangdao Railway — China's busiest coal transport corridor, with an annual throughput of 350 million tons — to deliver fuel for power generation to customers across China.