examples of freight cars 
The shape of the cars varies depending on the type of cargo being transported.
depressed-center flat car
Car with two extra trucks and a lowered deck for carrying heavy equipment.
Open-top car for carrying heavy bulk material, such as scrap metal and construction material.
bulkhead flat car
Flat car with sturdy plates at each end for carrying loose cargo (usually logs).
hopper ore car
Usually open-top hopper car of limited capacity for carrying minerals.
hard top gondola
Gondola with of a retractable metal roof for carrying bulk cargo.
Car with a simple wooden deck for carrying large objects, such as pipes, logs and heavy machinery.
Flat car for carrying standard-size shipping boxes.
Multilevel car for carrying vehicles, which are strapped down.
wood chip car
Open-top gondola car with a large compartment for carrying wood chips.