Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Transportation Vehicles (hierarchy name)
5. vehicles (transportation)
6. land vehicles
7. [land vehicles by form]
8. guideway vehicles
9. rail guideway vehicles
10. railroad cars
11. freight cars
12. [freight cars by form]
13. flatcars

Anotations

Scope note:

Flatcars having a portion of the floor set lower than the deck to accommodate special loads with oversized vertical dimensions; in use since the early 20th century. For flatcars in use since the mid-20th century with larger depressed central sections designed primarily to accommodate intermodal containers, use "well cars."