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. 北京地鐵是一個為北京城區和郊區服務的快速運輸鐵路網絡。地鐵歸屬北京市.現在有兩家運營商運營.一家是全資國有的北京地下鐵路運營公司,經營13條線路,還有一家北京地鐵公司,是與香港地鐵公司組成的合資企業.經營其他兩條線路。北京地鐵是*大陸古老的地鐵系統。*條線路于1969年開通.現在北京地鐵是世界上第二長的地鐵系統。