a railroad car, consisting of a flat platform with tie-downs , used for transportation of various goods

A railcar without sides; used for hauling machinery.

A freight car having a flat floor or deck laid on the under frame, with no sides, ends, or roof, designed for handling commodities or intermodal containers not requiring protection from the weather.

A flatcar (also flat car) is a piece of railroad rolling stock that consists of an open, flat deck on four or six wheels or a pair of trucks (US) or bogies (UK). The deck of the car can be wood or steel, and the sides of the deck can include pockets for stakes or tie-down points to secure loads. Flatcars designed for carrying machinery have sliding chain assemblies recessed in the deck.