Where can I book the Beijing to Ulaanbaatar (K23) sleeper train ticket online? I know you can book through China International Travel Service (CITS), but you need to submit an inquiry first and I don't have days to wait for a response. Did you go to the CITS office in Beijing just days before? Is there no online option at all? And don't tickets sell out if you book in-person shortly before? By the time I'm in Beijing, I have to take the train (sleeper, not seat) 2 days later. Is this possible? I also read of a website called "Travel China Guide" selling tickets, but are they legit? Thanks submitted by /u/SignificanceWhole978 [link] [comments]