A staff member prepares food materials for in-train meals in a kitchen on the train K9441, Feb 6, 2018. As the Spring Festival approaches, hundreds of millions of people head to their hometowns to meet with relatives and friends, leading to a huge demand for packaged meals on the train. To guarantee the quality of the packed meals, all the food materials must be purchased and delivered under a strict process. [Photo by Bao Liang/provided to chinadaily.com.cn]

A staff member prepares food materials for in-train meals in a kitchen on the train K9441, Feb 6, 2018. [Photo by Bao Liang/provided to chinadaily.com.cn]

A staff member prepares food materials for in-train meals in a kitchen on the train K9441, Feb 6, 2018. [Photo by Bao Liang/provided to chinadaily.com.cn]

A staff member cooks in a kitchen on the train K9441, Feb 6, 2018. [Photo by Bao Liang/provided to chinadaily.com.cn]

A staff member serves meals on the train K9441, Feb 6, 2018. [Photo by Bao Liang/provided to chinadaily.com.cn]

A staff member cooks in a kitchen on the train K9441, Feb 6, 2018. [Photo by Bao Liang/provided to chinadaily.com.cn]