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为了降低工程造价,日本对小断面地铁进行了研究,东京12号线是实施这些研究的第一条客运线。12号线包括从光丘开始的射线和进入并环绕市中心的30km 环线。正在施工的这部分以光丘至练马,长13km。线路将不与其他地铁线路或郊区铁路连接,也不与工厂或仓库等其他经营者联营。因此,车辆就没有必要与他们协调。这样,设计者在设计车辆、隧道和车站
In order to reduce construction costs, Japan studied the small section metro, and Tokyo Line 12 was the first passenger line to carry out these studies. Route 12 includes the rays from Hikarigaoka and the 30 km of the ring into and around the city center. This part of the construction is to Guangqiu Zhijian, 13km long. The line will not be connected to other metro lines or suburban railroads and will not be associated with other operators such as factories or warehouses. Therefore, there is no need for vehicles to coordinate with them. In this way, designers are designing vehicles, tunnels and stations