Aerial photo taken on Jan. 15, 2019 shows a train running along the Hongqiqu-Shuiye section of Watang-Rizhao Railway in central China's Henan Province. Over 7,000 heavy-haul freight train trips have been made on the Watang-Rizhao Railway in 2018. The railway, an artery of China's coal transportation, connects Wangtang Town in north China's inland coal-producing province of Shanxi with Rizhao, a port city in east China's Shandong Province. (Xinhua/Li An)

　　Aerial photo taken on Jan. 15, 2019 shows a train leaving the Hongqiqu station on Watang-Rizhao Railway in central China's Henan Province. Over 7,000 heavy-haul freight train trips have been made on the Watang-Rizhao Railway in 2018. The railway, an artery of China's coal transportation, connects Wangtang Town in north China's inland coal-producing province of Shanxi with Rizhao, a port city in east China's Shandong Province. (Xinhua/Li An)

　　A train runs along the Hongqiqu-Shuiye section of Watang-Rizhao Railway in central China's Henan Province, Jan. 15, 2019. Over 7,000 heavy-haul freight train trips have been made on the Watang-Rizhao Railway in 2018. The railway, an artery of China's coal transportation, connects Wangtang Town in north China's inland coal-producing province of Shanxi with Rizhao, a port city in east China's Shandong Province. (Xinhua/Li An)

　　Aerial photo taken on Jan. 15, 2019 shows a train running along the Hongqiqu-Shuiye section of Watang-Rizhao Railway in central China's Henan Province. Over 7,000 heavy-haul freight train trips have been made on the Watang-Rizhao Railway in 2018. The railway, an artery of China's coal transportation, connects Wangtang Town in north China's inland coal-producing province of Shanxi with Rizhao, a port city in east China's Shandong Province. (Xinhua/Li An)

　　A train passes Hongqiqu station along the Watang-Rizhao Railway in central China's Henan Province. Over 7,000 heavy-haul freight train trips have been made on the Watang-Rizhao Railway in 2018. The railway, an artery of China's coal transportation, connects Wangtang Town in north China's inland coal-producing province of Shanxi with Rizhao, a port city in east China's Shandong Province. (Xinhua/Li An)