Versions of 49 USC 20171 - Requirements for railroad freight cars placed into service in the United States on LawServer 2024 49 USC 20171 – Requirements for railroad freight cars placed into service in the United States 2023 49 USC 20171 – Requirements for railroad freight cars placed into service in the United States 2022 49 USC 20171 – Requirements for railroad freight cars placed into service in the United States