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铁路是“现代工业的先驱”。世界上迄今还没有任何一个幅员较大的国家，不建成铁路网而实现了现代化的。我国是具有11亿人口、960万km~2的大陆国家，为了适应社会主义商品经济的大发展，逐步建成疏密适度、与社会
The railway is “a pioneer in modern industry.” To date, there has not been any large country in the world that has been modernized without building a railway network. Our country is a mainland country with a population of 1.1 billion and 9.6 million km ~ 2. In order to adapt to the great development of the socialist commodity economy, China has gradually built a system of appropriate density and density with the society