Li Yanjie, 23, is a catenary worker in the Shantou High-speed Railway Power Supply Workshop of the Shenzhen Power Supply Section of Guangzhou Railway Group. He is mainly responsible for the daily inspection and maintenance of the catenary.
On the contact network of the nearly 7,929-meter Shenzhen-Shantou Expressway Bridge, they are like a group of spiders, maintaining the power supply, climbing or riding them or wiping them or lowering them. "I remember the first time I climbed this 10-meter pole. I was afraid of heights. I watched the objects on the ground getting smaller and smaller," he said.