Covered hopper wagons are used for cargo transported by rail that must be protected from the elements (chiefly rain) such as grain, sugar, and fertilizer. They are mostly self-discharging using gravity-unloading. They are also called Covered hopper car. Disclaimer Our content is not in any way legal advice or binding. The information provided by might not be the official legal or full definition. Also when pursuing a specific transaction you are encouraged to conduct your own due diligence and to consult legal counsel as appropriate.