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日本国铁在二次世界大战以前有复线2,300公里,战后第一个五年计划期间(1957—1960)修建复线300公里,第二个五年计划期间(1961—1964)修建复线600公里,第三次长期计划期间(1965—1968)修建复线1,600公里,1969年开始财政再建计划以来修建复线400公里,截止1977年国铁共有复线5,440公里,复线化率为25.6%。现除东海道、山阳、东北、上越、北陆等线已完全复线化外,还有若干部分复线化的线路。过去,国铁修建复线,主要采取随运量增大而打通“卡脖子”区段的方式,这当然是有效的。但是,在还有部分单线区间的主要干线上,却产生了以下的问题:1.列车会让等不必要的停车时间增加。在有部分单线区间的区段,列车会让停车时间
Japan’s state-owned railways had 2,300 km of double-track lines before World War II, 300 km of second-line plans during the first five-year plan period (1957-1960) and 600 km of second-line plans during the second five-year plan period (1961-1964) During the third long-term plan (1965-1968), 1,600 km of double-track lines were constructed and 400 km of double-track lines were constructed since the financial reconstruction project began in 1969. By 1977, the National Rail has a total of 5,440 km of second-line and a double-line rate of 25.6%. In addition to the East Hokkaido, Sanyo, northeast, the more the North Hokuriku line has been completely double line, there are a number of parts of the line of multi-line. In the past, the construction of a double-track railway by the National Railways mainly took the approach of opening up the “kar-neck” section as the traffic volume increased. This was of course valid. However, there are some main lines in the single-line section, but the following problems have arisen: 1. The trains will make unnecessary increase of parking time. In some sections of single-line section, the train will make parking time