CHONGQING, Feb. 19 (Xinhua) -- Train G3729, a chartered train for migrant workers who are about to return to work, left Chongqing West Railway Station here on Monday and headed towards Guangzhou South Railway Station. It is the first train of its kind that departed from Chongqing after the Spring Festival holiday this year. Over 300 migrant workers from Chongqing and southwest China's Sichuan Province took the train.