Hopper Car- (Pronunciation: \ˈhä-pər\):  An open-top car for hauling items that don't need protection from the weather like coal and gravel. Hopers empty through doors in funnel-like bins in the bottom of the car, and can be identified by the outlet gates (chutes) on the bottom of each car. Covered Hoppers have roofs; They carry grain and other items that need protection from weather.