"Pathfinder" train important in guaranteeing passengers' safety

Steward of a "pathfinder" train rests near window on the way from Wuhan to Zhengzhou, Jan. 25, 2018. The "pathfinder" train, which drives before all high-speed trains for checking safety problems, plays an important role in guaranteeing passengers' safety during their travel. (Xinhua/Xiao Yijiu)