自1863年世界上第一条地铁在英国伦敦建成通车,标志着城市轨道交通方式的诞生。在不同国家、不同发展阶段内,凡经济发达的国家与城市都建有轨道交通系统。城市轨道交通系统亦被当作展示国家在经济、社会以及技术上高人一等的指标,成为一个国家综合国力、城市经济实力、人们生活水平及现代化的重要标志。 Since 1863 the world’s first subway in London opened to traffic, marking the birth of urban rail transit. In different countries and at different stages of development, rail transport systems have been established in all economically developed countries and cities. The urban rail transit system is also used as an indicator to show that the country is superior in economy, society and technology. It has become an important symbol of a country’s overall national strength, urban economic strength, people’s living standard and modernization.