Workers flatten the gravel beside a rail line at Hohhot East Railway Station, Inner Mongolia autonomous region on March 31. The construction of Hohhot high-speed railway has almost been completed and has now entered the debugging and testing period, according to Hohhot railway department. [Photo/Xinhua]

A train tests newly laid track at Hohhot East Railway Station, Inner Mongolia autonomous region on March 31. The construction of Hohhot high-speed railway has almost been completed and has now entered the debugging and testing period, according to Hohhot railway department. [Photo/Xinhua]