地铁即地下通行的火车,这种火车将连接现有的城市边缘的火车站,将城市内外的交通系统连接在一起,比起地面交通的拥堵和障碍丛生,地下交通的准时性似乎成为了它最可靠的性能。北京地铁是中国第一条地铁。1965年2月4日,由毛泽东主席亲自批示,当时确定的建设方针是“适应军事上的需要,兼顾城市交通”。1965年7月1日北京地铁第一期工程开工,于1969年10月1日建成通车。到目前为止, Subway is an underground train that connects existing train stations on the edge of the city to connect the transportation systems inside and outside the city and the punctuality of underground traffic appears to be greater than the congestion and obstruction of ground traffic The most reliable performance. Beijing Subway is China’s first subway. On February 4, 1965, Chairman Mao Zedong personally instructed that the principle of construction set at the time was “to meet military needs and give consideration to urban traffic.” July 1, 1965 Beijing subway started the first phase of the project, completed and opened to traffic on October 1, 1969. so far,