Complete truck (bogie) assemblies for self-propelled vehicles go under 860711, and those for non-powered rolling stock under 860712. Individual axles, wheels, and their directly associated parts—when not imported as part of a complete truck assembly—fall under 860719. If wheels and axles are imported already assembled into a complete bogie, the assembly subheadings apply.

Certain steel railway components, including wheels and axles, have been subject to antidumping or countervailing duty investigations targeting specific countries of origin. The applicability of any such measure depends on the specific tariff line and the country of origin of the goods. Importers should check the current CBP and Commerce Department order lists for the relevant subheading before entry.