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一、前言华东是我国经济发达地区，工农业生产总值占全国三分之一，而铁路营业里程仅为全国十分之一，客货运输能力严重不足。特别是近几年来实行对外开放、对内搞活的经济政策，运量急剧上升，运能不能适应运量增长需要，制约了这一地区国民经济进一步发展。“七五”期间，进?
I. Introduction East China is a economically developed area in China. Its gross industrial and agricultural output accounts for one third of the country’s total. The mileage of railways is only one-tenth that of the country’s total, with a serious shortage of passenger and freight transport capacity. In particular, in recent years, the economic policy of opening to the outside world and invigorating the domestic economy have witnessed a rapid increase in traffic volume and an increase in traffic volume that can not meet the needs of traffic volume growth, which has restricted the further development of the national economy in this area. During the “Seventh Five-Year Plan” period,