The photo, taken on January 24, shows construction workers braving the cold to work on the steel roof of the Changsha West Railway Station. The station is undertaken by the China Railway Construction Engineering Group. Currently its metal roof construction is in full swing. (Photo/Guo Liliang, Hunan Daily)

The photo, taken on January 24, shows construction workers braving the cold to work on the steel roof of the Changsha West Railway Station. The station is undertaken by the China Railway Construction Engineering Group. Currently its metal roof construction is in full swing. (Photo/Guo Liliang, Hunan Daily)

The photo, taken on January 24, shows construction workers braving the cold to work on the steel roof of the Changsha West Railway Station. The station is undertaken by the China Railway Construction Engineering Group. Currently its metal roof construction is in full swing. (Photo/Guo Liliang, Hunan Daily)

The photo, taken on January 24, shows construction workers braving the cold to work on the steel roof of the Changsha West Railway Station. The station is undertaken by the China Railway Construction Engineering Group. Currently its metal roof construction is in full swing. (Photo/Guo Liliang, Hunan Daily)