A Complete Collection of 100000 Whys
Fav十万个为什么
为什么地铁轨道有第三轨？
地铁轨道有第三轨主要是为了供电、减少隧道空间占用以及提高供电效率共同作用的结果。
1、供电。第三轨，也称为供电轨，是地铁供电系统的一部分。它为列车提供动力，通过列车集电靴与第三轨接触获取电能，驱动列车运行。
2、减少隧道空间占用。与架空接触网相比，第三轨系统安装在轨道旁边，不占用隧道上方空间，使得隧道断面可以设计得更小，降低建设成本。
3、提高供电效率。第三轨系统结构简单，维护方便，能够提供稳定的供电连接，减少能量损耗，提高供电效率。
总结：地铁轨道有第三轨是为了供电、减少隧道空间占用以及提高供电效率共同作用的结果。
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