The Beijing Subway is a rapid transit rail network that serves the urban and suburban districts of Beijing municipality. The subway is owned by the city of Beijing and has two operators, the wholly state-owned Beijing Mass Transit Railway Operation Corp., which operates 13 lines, and the Beijing MTR Corp., a public-private joint venture with the Hong Kong MTR, which manages the other two lines.TheBeijing Subway is the oldest metro system in mainland China. The first line opened in 1969 and it is the second longest subway system in theworld now. 北京地铁是一个为北京城区和郊区服务的快速运输铁路网络。地铁归属北京市.现在有两家运营商运营.一家是全资国有的北京地下铁路运营公司,经营13条线路,还有一家北京地铁公司,是与香港地铁公司组成的合资企业.经营其他两条线路。北京地铁是*大陆古老的地铁系统。*条线路于1969年开通.现在北京地铁是世界上第二长的地铁系统。