Workers lay rail tracks along the Hubei segment of Ordos-Ji'an rail line in Huopai Township of Xiangyang, central China's Hubei Province, June 29, 2018. Track laying of Hubei section of China's longest heavy-duty railway under construction started on Friday. The railway line links north China's Inner Mongolia Autonomous Region and east China's Jiangxi Province. (Xinhua/Du Huaju)

A vehicle carrying rail tracks is seen at the construction site of the Hubei segment of Ordos-Ji'an rail line in Huopai Township, Xiangyang City, central China's Hubei Province, June 29, 2018. Track laying of Hubei section of China's longest heavy-duty railway under construction started on Friday. The railway line links north China's Inner Mongolia Autonomous Region and east China's Jiangxi Province. (Xinhua/Du Huaju)

Workers lay rail tracks along the Hubei segment of Ordos-Ji'an rail line in Huopai Township of Xiangyang, central China's Hubei Province, June 29, 2018. Track laying of Hubei section of China's longest heavy-duty railway under construction started on Friday. The railway line links north China's Inner Mongolia Autonomous Region and east China's Jiangxi Province. (Xinhua/Du Huaju)

Workers lay rail tracks along the Hubei segment of Ordos-Ji'an rail line in Huopai Township of Xiangyang, central China's Hubei Province, June 29, 2018. Track laying of Hubei section of China's longest heavy-duty railway under construction started on Friday. The railway line links north China's Inner Mongolia Autonomous Region and east China's Jiangxi Province. (Xinhua/Du Huaju)