Abstract: A machine which travels on railroad rails includes a conveyor belt which transports metallic objects from a railway bed into a hopper. The conveyor belt revolves around a pair of rollers mounted on the framework of a conveyor belt assembly. One roller magnetically picks up the metallic objects and a hydraulic motor powers the other roller to drive the conveyor belt. The magnetized roller is mounted via two mounting bearings which slidably engage the assembly. An adjustment bolt on the assembly engages the mounting bearing to move the magnetized roller to adjust conveyor belt tension to facilitate replacement of the belt. A lift beside the assembly raises and lowers one end of the assembly which rotates about a pivot tube within the conveyor belt. The lift, pivot tube and hydraulic lines connected to the motor are all situated to allow the belt to be removed without interference therefrom.