Hopper Cars
Railcars that permit top loading and bottom unloading of bulk commodities; some hopper cars have permanent tops with hatches to provide protection against the elements.
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Modern Hopper Car Unloading
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What is HOPPER CAR? What does HOPPER CAR mean? HOPPER CAR meaning, definition & explanation
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World Amazing Modern Intelligent Technology Machines Unloading Coal Train Rotary Dumper Operation