There are three types of coaches on the Tibet train, the first class soft-berth sleeper, the second class soft-berth sleeper and soft seat coaches. Since the journey is really long, most travellers prefer the sleepers.
The soft-berth sleeper is the best coach in Tibet train. It provides independent LCD TV, full-length mirror, independent luggage storage space, coat rack and the door can be locked, compared to the open room of hard-berth sleeper. The soft is relatively safer. There are only 64 berths in the train.