I am in Tibet now and want to go to Altay, Xinjiang. How to plan the route only by train?

Now the new Tibet line is not easy to go. I think it is feasible and convenient to take Lhasa-Golmud-Huatugou-Mangya Hangwei-Ruoqiang (eating dates)-Korla (eating pears)-train-Urumqi-train-Beitun (Altay) without detours, and the scenery over Altun Mountain is good, and the customs in southern Xinjiang are very good. Not many people left, but also Golmud to Korla.