The railway's construction will have to overcome frozen earth, landslides, rock slides, cold weather and a lack of oxygen due to high altitude in some places.
The railway's planners are still examining intricate and difficult geological conditions along the proposed lines, according to the ministry spokesman, who was quoted by Xinhua News Agency.
A new start date has not been set, the spokesman said.
The proposed railway will span 1,629 km, 650 km of which will be in Sichuan. Trains will travel at a maximum speed of 200 km per hour and will take only eight hours to reach Lhasa, the capital of the Tibet autonomous region, according to Wang Minghui, deputy chief of the Chengdu railway administration.
The rail line is expected to be finished in eight years with an investment of nearly 54 billion yuan ($7.9 billion) in State funds.
Construction of the Sichuan-Tibet railway is expected to propel economic and tourism development along the line.
Travelers now have two ways to reach Lhasa from Chengdu: by National Highway No 318, which takes three days, and via Train T22, which takes nearly 45 hours.
The Hengduan Mountains near the line have an abundance of natural resources, including water, vegetation and minerals, said Li Changping, chief of the Ganzi Tibetan autonomous prefecture in Sichuan.
Eighty-two counties and districts along the line in Sichuan and Yunnan provinces and Tibet boast snow-capped mountains, grasslands, and Tibetan and Buddhist cultures.
The Yulong Copper Mine near the mountain in Tibet has a proven reserve of 6.5 million tons of copper, first among the country's copper mines.
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