Freight cars operating under standard rail interchange agreements typically move across the border without formal consumption entry, as they are considered to remain in the ownership of the foreign railroad and return after use. However, if a car is sold or leased to a US entity for domestic use, a formal import entry is required and duties apply. The specific arrangement should be reviewed with a customs broker to determine the correct entry type.

All non-self-propelled goods wagons — including tank cars, refrigerated cars, flatcars, and covered hoppers — fall within this heading regardless of their specialized design. The heading does not subdivide by cargo type at the SITC level, though the corresponding HTS subheadings may make finer distinctions that affect the applicable duty rate.