匆忙的脚步,拥挤的人流,呼啸而过的列车,洁净明亮的车厢和站厅……这是地铁留给人们的印象。支撑着这些“印象”的,是背后鲜为人知的机构设置和工种分类。只要身在这个系统里,不管你身处什么样的位置,安全,都应是你头脑中永远的“关键词”。对于像北京这样拥有两千多万人口的特大城市来说,用地铁来缓解交通压力已成为社会共识。经过多年 Hurried footsteps, crowds of people, whistling by the train, clean bright car and station hall ... ... This is the subway left the impression. Backing up these “Impressions ”, is behind the little-known organizational settings and job classification. As long as you are in this system, no matter where you are in, safety, should always be your mind “Keywords ”. For megacities such as Beijing, which have a population of more than 20 million, using subway to ease traffic pressure has become a social consensus. After many years