2010年年末,5条地铁线路同时开通,总长度达108公里,成为北京历史上同时开通轨道交通线路最多的一次,本刊也就北京轨道交通建设工程资料管理作了专题报道。一年后,伴随3条新线的开门载客,北京地铁线路数量和运营总里程再次被刷新。这次我们走进中央档案馆,探寻新中国第一条地铁线路的建设历程。 By the end of 2010, five subway lines opened at the same time with a total length of 108 km, making Beijing the largest number of simultaneously opened rail transit lines in history. The magazine also made special reports on the data management of Beijing’s rail transit construction projects. A year later, with the opening of three new lines of passengers, the total number of Beijing subway lines and operating mileage was refreshed. This time we walked into the Central Archives to explore the construction process of the first subway line in New China.