By 2050 seven out of ten people are expected to be living in cities around the world. With limited space in already built-up metropolises, it is essential that infrastructure is installed underground. One such project that will undoubtably change the underground map of a city is the Grand Paris Express. With around 200km of track on four new, fully automated subway lines, 68 stations and seven technical centres - the Parisian project is currently one of the largest infrastructure projects in Europe.
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机译：到2050年，预计将有十分之七的人生活在世界各地的城市中。在已经建成的大都市中，由于空间有限，必须将基础设施安装在地下。大巴黎快车（Grand Paris Express）是一个无疑会改变城市地下地图的项目。巴黎项目拥有4条新的全自动地铁线，68个车站和7个技术中心，全长约200公里，目前是欧洲最大的基础设施项目之一。
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