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北京枢纽南苑支线 位于北京市内,起自永定门站(今北京南站),至南苑万字地,全长8公里,轨距1米,1906年2月开工,1907年2月通车。1941年9月改建为标准轨距,北与永定门站接轨、南延至南苑军用机场,正线延长至10公里。1958年东南环线通车时被切断,分为永定门至大红门联络线和大红门至南苑支线两段,1981年修建北京市南三环路切断永定门
Beijing hub Nanyuan branch is located in Beijing, starting from Yongdingmen station (now Beijing South Railway Station), to Nanyuan million words, a total length of 8 km, gauge 1 meter, started in February 1906, opened to traffic in February 1907. September 1941 converted into a standard gauge, north and Yongding Gate Station convergence, south to Nanyuan military airport, the main line is extended to 10 km. In 1958 the southeast ring road opened to traffic was cut off, divided into Yongding Gate to Dahongmen contact line and Dahongmen to Nanyuan branch two sections, in 1981 to build the Beijing South Third Ring Road cut Yongding Gate