(一)铁路网密度与铁路运营特点苏联是世界上国土面积最大的国家,比美国大一倍半,它的铁路运输业在国民经济中具有特殊重要的位置。1974年苏联铁路的营业里程为137,500公里,1977年达到139,600公里。但是苏联与一些资本主义国家相比较,按国土面积的铁路网密度仅为美国的六分之一,日本 1. Railway Network Density and Railway Operation Features The Soviet Union is the largest country in land area in the world, one and a half times larger than the United States. Its railway transportation industry has a special and important position in the national economy. In 1974, Soviet railway mileage was 137,500 kilometers and in 1977 it reached 139,600 kilometers. However, compared with some capitalist countries in the Soviet Union, the railway network density by area of ​​land is only one-sixth that of the United States. Japan