截至2013年年底,我国已有19个城市拥有地铁,总里程达到2366公里。预计到2020年全国拥有轨道交通的城市将达到50个,到2020年我国轨道交通要达到近6000公里的规模,在轨道交通方面的投资将达4万亿元,也就是说未来几年城市轨道交通的投资将保持大幅增长。当前多个城市掀起轨道交通建设投资热潮。据国家发改委统计,目前中国获批轨道交通建设规划的城市已达36个,今年我国城市 As of the end of 2013, 19 cities in our country already have subways with a total mileage of 2,366 km. It is estimated that there will be 50 cities with rail transit in China by 2020, and the rail transit in China will reach nearly 6,000 km by 2020, and the investment in rail transit will reach 4 trillion yuan, which means that in the next few years, the urban rail Traffic investment will maintain a substantial growth. At present, many cities set off a boom in rail transit construction investment. According to the statistics of the State Development and Reform Commission, at present, 36 cities have been approved to construct rail transit in China. This year, the cities in our country