新中国成立40多年来,我国铁路建设有了很大发展,由解放前的2.2万公里铁路,增至5.3万多公里,其中复线13700公里,复线率已达24.5%,大大超过美国;电气化铁路8742公里,电化率达16%,数量上已超过日本和法国。然而,我国地域辽阔,人口众多,现有铁路和基础 Over the past 40 years since the founding of new China, great progress has been made in railway construction in our country, from 22,000 kilometers of railways before the liberation to more than 53,000 kilometers, of which 13,700 kilometers of second lines have reached 24.5%, far exceeding that of the United States. The electrified railway 8742 kilometers, the rate of electrification reached 16%, the number has surpassed Japan and France. However, our country has a vast territory, a large population, an existing railway and a foundation