Hauling system is key equipment in the main cable erection of suspension bridge. It is a complex system which consist of many kinds of mechanic and the operators.

牵引系统是悬索桥主缆架设施工的关键设备，它是多种机械设备与操作人员组成的一个复杂的大系统。

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First introduced in the late 1800s to save the strain on horses hauling carts up the city's steep inclines, the 15, 500-pound cable-powered cars grip a continuously moving underground cable with pliers-like gear to travel the streets of San Francisco.

NPR: San Francisco Cable Car Accidents Costs Millions