1863年世界上第一条地铁——伦敦地铁建成,人类的地铁时代开始了;1969年我国第一条地铁——北京地铁一期工程建成通车,中国的地铁时代开始了;2014年长沙第一条地铁——2号线开通,长沙也开始了地铁时代。而随着6月28日11点18分长沙地铁1号线的开通试运营,长沙城更是进入了换乘时代。轨道交通具有安全、快速、环保、运量大、方便、准时等诸多优点,因此轨道交通近几年在中国发展速度非常快。据相关资料显示,全国已有39个城市获批建设地铁,预计到2020年,全国地铁总里程将达到6000公 In 1863 the world’s first subway - the London subway was completed, the human metro era began; 1969 China’s first subway - a Beijing subway project opened to traffic, China’s subway era began; 2014 first in Changsha Metro - Line 2 opened, Changsha has also started the era of the subway. With the opening of the Changsha Metro Line 1 trial at 11:18 on June 28, Changsha City is entering the era of transfer. Rail transit is safe, fast, environmentally friendly, large volume, convenient, on time and many other advantages, so the rapid development of rail transit in China in recent years. According to the relevant information, 39 cities across the country have been approved to build the subway. It is estimated that by 2020, the total mileage of the national subway will reach 6000 kilometers