FTA-funded transit projects must comply with Buy America domestic content requirements, which mandate a minimum percentage of US-manufactured components and final assembly in the US. These requirements operate separately from customs duties — a vehicle may be legally imported and dutiable while still being ineligible for use on a federally funded project unless a waiver is granted. Transit agencies should coordinate with FTA and legal counsel before procurement.

The distinction rests on the track gauge, operating environment, and design standard rather than propulsion type alone. Tramway vehicles are designed for street-running or light-rail infrastructure, while railway coaches operate on standard heavy-rail networks. Both self-propelled types fall within this heading, but the underlying HTS subheading may differ, affecting duty rates and any applicable trade-remedy exposure.