Staff members put packed meals inside a basket in a catering management company for high speed trains in Qingdao, east China's Shandong Province, Feb. 3, 2019. Packed meals on high speed trains are prepared by specialist catering service companies. Each meal is checked by taste, nutrition and price before it is served to passengers. (Xinhua/Li Ziheng)

Dishes are seen at a workshop to be packed in a catering management company for high speed trains in Qingdao, east China's Shandong Province, Feb. 3, 2019. Packed meals on high speed trains are prepared by specialist catering service companies. Each meal is checked by taste, nutrition and price before it is served to passengers. (Xinhua/Li Ziheng)

Staff members prepare food in a catering management company for high speed trains in Qingdao, east China's Shandong Province, Feb. 3, 2019. Packed meals on high speed trains are prepared by specialist catering service companies. Each meal is checked by taste, nutrition and price before it is served to passengers. (Xinhua/Li Ziheng)

A chef cooks meals in a catering management company for high speed trains in Qingdao, east China's Shandong Province, Feb. 3, 2019. Packed meals on high speed trains are prepared by specialist catering service companies. Each meal is checked by taste, nutrition and price before it is served to passengers. (Xinhua/Li Ziheng)

Staff members prepare food in a catering management company for high speed trains in Qingdao, east China's Shandong Province, Feb. 3, 2019. Packed meals on high speed trains are prepared by specialist catering service companies. Each meal is checked by taste, nutrition and price before it is served to passengers. (Xinhua/Li Ziheng)

Staff members get disinfected before preparing food in a catering management company for high speed trains in Qingdao, east China's Shandong Province, Feb. 3, 2019. Packed meals on high speed trains are prepared by specialist catering service companies. Each meal is checked by taste, nutrition and price before it is served to passengers. (Xinhua/Li Ziheng)

Staff members prepare food in a catering management company for high speed trains in Qingdao, east China's Shandong Province, Feb. 3, 2019. Packed meals on high speed trains are prepared by specialist catering service companies. Each meal is checked by taste, nutrition and price before it is served to passengers. (Xinhua/Li Ziheng)

Dishes are seen at a workshop to be packed in a catering management company for high speed trains in Qingdao, east China's Shandong Province, Feb. 3, 2019. Packed meals on high speed trains are prepared by specialist catering service companies. Each meal is checked by taste, nutrition and price before it is served to passengers. (Xinhua/Li Ziheng)