最近,无论是笔者浏览网页还是翻看杂志,抑或是查询展会信息,有四个字出现的频率最高,那就是“轨道交通”。轨道交通被称为“城市交通的主动脉”。在新一轮扩大内需投资中,轨道交通建设是一个突出的投资亮点。无论是建设规模,还是建设速度,我国的轨道交通发展目前都正在经历一个高速发展 Recently, whether it is the author to browse the web or read magazines, or check the exhibition information, there are four words appear the highest frequency, that is “rail transit ”. Rail transit is called “the aorta of urban traffic.” In the new round of expanding domestic demand for investment, the construction of rail transit is a prominent investment highlight. Regardless of the scale of construction or the speed of construction, the development of rail transit in our country is currently undergoing a rapid development