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First take the train from Cangnan to Shanghai Hongqiao Station, then take the train from Shanghai Hongqiao Station to Chongqing North or Chengdu East. The trains from Cangnan to Shanghai Hongqiao are 9 times a day, and the latest time to arrive at Shanghai Hongqiao is at 22:49. The trains from Shanghai Hongqiao to Chengdu are two shifts a day, 6am and 6:36am. So no matter how you change the car, you have to stay at Hongqiao Railway Station for one night. .