Please analyze the Yunnan-Tibet Railway or Sichuan-Tibet or Qinghai-Tibet Railway from a geographical perspective, and talk about the advantages, disadvantages, and difficulty of construction...

In general, the biggest difficulties of these three railways are: high cold, lack of oxygen, frozen soil, and fragile ecology. Let’s talk about each one below;

Yunnan-Tibet Railway: Difficulty: The surface is broken (karst landform), the terrain is highly undulating (Hengduan Mountain), and there are many valleys (Lancang River).

Advantages: It can connect Yunnan and Guangxi, find the outlet to the sea, and the construction length is small.

Sichuan-Tibet Railway: Difficulty: The altitude difference is too large (from the Sichuan Basin to the Qinghai-Tibet Plateau), and there are swamps in western Sichuan.

Benefits: Sichuan has a developed economy, a dense population, and is close to the Yangtze River route, which is conducive to promoting the economic development of the Qinghai-Tibet region.

The disadvantage of the Qinghai-Tibet Railway is that the economic development level along the line is low, it is located deep in the northwest and has the longest mileage.

To sum up, why did you choose Qinghai-Tibet? The main reason is that the Qinghai-Tibet line only needs to overcome certain problems, while the other two lines have other problems and are too difficult to construct. Moreover, passing through sparsely populated areas can also protect wild animals and minimize the ecological damage caused by the railway.