A dispatcher regroups freight trains at the Xilinhot station in Xilinhot of Xilingol League, north China's Inner Mongolia Autonomous Region, Jan. 8, 2021. The dispatchers here spent up to seven hours working outdoors in the cold weather, with the lowest temperature reaching minus 30 degrees Celsius. They regrouped the carriages and sent them to their destinations to ensure smooth operation of trains in winter. (Xinhua/Peng Yuan)

A dispatcher sets off with a train to regroup freight trains at the Xilinhot station in Xilinhot of Xilingol League, north China's Inner Mongolia Autonomous Region, Jan. 8, 2021. The dispatchers here spent up to seven hours working outdoors in the cold weather, with the lowest temperature reaching minus 30 degrees Celsius. They regrouped the carriages and sent them to their destinations to ensure smooth operation of trains in winter. (Xinhua/Bei He)

A dispatcher works at the Xilinhot station in Xilinhot of Xilingol League, north China's Inner Mongolia Autonomous Region, Jan. 8, 2021. The dispatchers here spent up to seven hours working outdoors in the cold weather, with the lowest temperature reaching minus 30 degrees Celsius. They regrouped the carriages and sent them to their destinations to ensure smooth operation of trains in winter. (Xinhua/Bei He)

A dispatcher works at the Xilinhot station in Xilinhot of Xilingol League, north China's Inner Mongolia Autonomous Region, Jan. 8, 2021. The dispatchers here spent up to seven hours working outdoors in the cold weather, with the lowest temperature reaching minus 30 degrees Celsius. They regrouped the carriages and sent them to their destinations to ensure smooth operation of trains in winter. (Xinhua/Peng Yuan)

A dispatcher regroups freight trains at the Xilinhot station in Xilinhot of Xilingol League, north China's Inner Mongolia Autonomous Region, Jan. 8, 2021. The dispatchers here spent up to seven hours working outdoors in the cold weather, with the lowest temperature reaching minus 30 degrees Celsius. They regrouped the carriages and sent them to their destinations to ensure smooth operation of trains in winter. (Xinhua/Bei He)

A dispatcher works at the Xilinhot station in Xilinhot of Xilingol League, north China's Inner Mongolia Autonomous Region, Jan. 8, 2021. The dispatchers here spent up to seven hours working outdoors in the cold weather, with the lowest temperature reaching minus 30 degrees Celsius. They regrouped the carriages and sent them to their destinations to ensure smooth operation of trains in winter. (Xinhua/Peng Yuan)

A dispatcher sets off with a train to regroup freight trains at the Xilinhot station in Xilinhot of Xilingol League, north China's Inner Mongolia Autonomous Region, Jan. 8, 2021. The dispatchers here spent up to seven hours working outdoors in the cold weather, with the lowest temperature reaching minus 30 degrees Celsius. They regrouped the carriages and sent them to their destinations to ensure smooth operation of trains in winter. (Xinhua/Peng Yuan)

A dispatcher rubs to warm his hands at the Xilinhot station in Xilinhot of Xilingol League, north China's Inner Mongolia Autonomous Region, Jan. 8, 2021. The dispatchers here spent up to seven hours working outdoors in the cold weather, with the lowest temperature reaching minus 30 degrees Celsius. They regrouped the carriages and sent them to their destinations to ensure smooth operation of trains in winter. (Xinhua/Peng Yuan)