Heavy Duty C Track Cable Trolley Festoon System For Crane Traveling Heavy Duty C Track Cable Trolley Festoon System For Crane Traveling is a conductive form of power supply for the crane trolley. It consists of a walking wheel, a bracket and a supporting plate. The flexible cable is fixed on the supporting plate. The traction frame and the I-steel cable pulley are synchronized to achieve the purpose of cable power trolley. Cable trolley is also called cable block, cable pulley, cable rail trolley, cable block trolley, I-beam cable block, I-beam trolley, cable conductive trolley.