My friends and me (9 people) planning to go to Xian & Guangzou from Shenzen. I understand there is train from shenzen to Xian. 1. Is it adviseable to go from Shenzen to Xian & going back from xian to guangzou and to shenzen or Shenzen to guangzou & from guangzhou to Xian, Going back from xian to shenzen. 2. How about the train ? Is it comfortable to travel more than 24 hours by train. What there have in the train Tqvm for advice
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