T27 started at 2 1.30 Beijing West Night, lasted 46.30 hours, and arrived in Lhasa at 20.00.
Hard seat 389, hard berth 699 lower berth, soft berth 1079 lower berth.
There is nothing wrong with being alone. After all, you spend most of your time on the train and can't get into the Potala Palace. You need to buy a ticket 1-3 days in advance to enter. Tickets for the same day are not sold.
It is suggested to find a partner to go with, go by train and come back by plane.