The Concern at an Altitude of 4,400 Meters

　　

        At the foot of Yuzhu Peak, the Qinghai-Tibet Railway stretches like a black silk ribbon, running straight along the horizon toward the sky. Workers in the Geermu Maintenance Depot of the Wangkun Line Workshop, wrapped in thick cotton clothes, are conducting maintenance work during the maintenance window. Bent over, measuring and tightening, their actions are meticulous and precise.