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 (Photo/China Railway)

Tenzin Dolker is a delivery woman who works along the Qinghai-Tibet Railway Nagqu section, north of Lhasa, the capital city of southwest China’s Tibet Autonomous Region.

Every day, Dolker and her colleagues cook food and then carry it from their local service center to Nagqu train station, where train drivers and maintenance workers will take a break to enjoy a meal.

All trains running in and out of Tibet stop at Nagqu station. After 10 or more hours driving through the area, which lacks good levels of oxygen and is virtually uninhabited, the drivers need a meal to keep up their strength.

Tenzin Dolker (Photo/China Railway)

Every day, Dolker takes multiple trips between the service center and the train station. The distance between both points is 7 or 8 kilometers, with an average elevation of 4,500 meters above sea level.

When it snows, she has to use both her hands and feet to transport the food up the long slope which lies in front of the train station.

Cargo trains stop for a shorter period, pausing at the station for only a few minutes, usually at night. To make sure the drivers are able to eat, Dolker and her colleagues spend the whole night delivering food. The work is challenging, but she feels it is worthwhile as the drivers are satisfied with her service.