A hopper car or hopper wagon is a type of railroad freight car used to transport loose bulk commodities such as coal, ore, grain, and track ballast. Two main types of hopper car exist: covered hopper cars, which are equipped with a roof, and open hopper cars, which do not have a roof.

What is a hopper in slang?

a person or thing that hops. Informal. a person who travels or moves frequently from one place or situation to another (usually used in combination):a two-week tour designed for energetic city-hoppers. any of various jumping insects, as grasshoppers or leafhoppers.

What is the origin of the word Hopper?

hopper (n. 1)

"person or animal that hops," mid-13c., agent noun from hop (v.). From c. 1200 as a surname, and perhaps existing in Old English (which had hoppestre "female dancer").