How to get to the time and route by train? What is the approximate cost? Thank you.

If you travel by yourself, you can take the train to Zhengzhou first and buy a connecting ticket to Lhasa directly. As for how much, it's hard to say. The tourist season in Lhasa is obvious. July-10 is the peak season, and the price is six or seven thousand. It's more than 2000 yuan in the off-season, so where are you going? Now, there is no cost estimate. You can look at your time, arrangement and funds first. Search the internet to see the scenic spots, set the route and see the experiences of other friends!