For best operation, use two different variable voltage circuits - one for the loader; the other, for the barrel car. First, unload the barrel car. Then move the car under the flap on the loader. Watch the barrels vibrate up the ramp. As each barrel falls into the car, move it up. After 2 or 3 have fallen into the car, stop the loader. Turn down the voltage on the car. Use just enough to make the barrels snug up against each other. Then load the rest. It takes some practice, but the whole car can be filled with barrels.