Flight T264 leaves the next day. This month 13:07 departs from Guangzhou on a single day and stops in Changsha at 20:03 on the same day. So there is no car on June 6, and there will be a car on June 7. This bus is seated in the right place all the way, and no station tickets are sold. As long as you can get a ticket, there must be a seat (if you buy a hard seat ticket). A small house was built next to the main entrance of the ticket hall of Changsha Railway Station to sell tickets for this train. You don't have to wait in line, you can buy it ten days in advance. Changsha to Lhasa hard seat 40 1 yuan, hard sleeper 788 yuan, hard sleeper 8 12 yuan, hard sleeper 839 yuan, soft sleeper 1249 yuan, soft sleeper 1279 yuan. Changsha Station allocated 57 tickets, including 38 hard seats, 4 hard sleepers 15 and 4 soft sleepers. The sale in Xining is limited to far away places, that is, only Golmud, Naqu and Lhasa are sold.
Answer to the supplementary question: Yes! Knowing that some trains entering Tibet on the Internet have incorrect fares, I once went to the cabin of Changsha Railway Station to copy T264 fares. It happened that a passenger was arguing with the conductor about buying a ticket to Lanzhou, but the conductor said they didn't sell it. It was set in the computer and there was no ticket at all.