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成昆铁路上漂亮的展线，最后绕成一副眼镜，妹子给大家介绍一下！
乐武展线是成昆铁路上七大展线之一，铁路在这里也是上中下三层展线，最后绕成了一副漂亮的眼镜形状。有朋友在问，为什么铁路要绕圈？其实功能和盘山公路相似，就是为了降低坡度，保证行车安全……
成昆铁路特辑56/127
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