Workers line up to check in at Kunming South Railway Station in Kunming, southwest China's Yunnan Province, Feb. 24, 2020. A total of 563 workers from Qujing, Lincang and Baoshan cities in Yunnan took the customized train to Huizhou City of Guangdong Province to resume work on Monday. (Xinhua/Hu Chao)

Workers board a customized train at Kunming South Railway Station in Kunming, southwest China's Yunnan Province, Feb. 24, 2020. A total of 563 workers from Qujing, Lincang and Baoshan cities in Yunnan took the customized train to Huizhou City of Guangdong Province to resume work on Monday. (Xinhua/Hu Chao)

A worker holding her child waits to board a customized train at Kunming South Railway Station in Kunming, southwest China's Yunnan Province, Feb. 24, 2020. A total of 563 workers from Qujing, Lincang and Baoshan cities in Yunnan took the customized train to Huizhou City of Guangdong Province to resume work on Monday. (Xinhua/Hu Chao)

Workers wait to board a customized train at Kunming South Railway Station in Kunming, southwest China's Yunnan Province, Feb. 24, 2020. A total of 563 workers from Qujing, Lincang and Baoshan cities in Yunnan took the customized train to Huizhou City of Guangdong Province to resume work on Monday. (Xinhua/Hu Chao)

Workers head for the platform to board a customized train at Kunming South Railway Station in Kunming, southwest China's Yunnan Province, Feb. 24, 2020. A total of 563 workers from Qujing, Lincang and Baoshan cities in Yunnan took the customized train to Huizhou City of Guangdong Province to resume work on Monday. (Xinhua/Hu Chao)

Workers board a customized train at Kunming South Railway Station in Kunming, southwest China's Yunnan Province, Feb. 24, 2020. A total of 563 workers from Qujing, Lincang and Baoshan cities in Yunnan took the customized train to Huizhou City of Guangdong Province to resume work on Monday. (Xinhua/Hu Chao)