Appendix D of the Association of American Railroads (AAR) Field Manual provides a listing of job codes and data elements utilized when performing repairs to Tank Cars and Covered Hopper Cars not included in standard AAR job codes. The purpose of these job codes is to provide uniform and accurate data reporting to the car owner for the purposes of estimating, billing, auditing, and analysis. Data may be sent through Railinc’s CRB Data Exchange, but job codes will have neither a material nor labor price associated with them. The utilization of these job codes is not mandatory per the AAR Interchange Rules.

Appendix D is maintained and quarterly updated by the Railway Supply Institute (RSI) Appendix D Task Force. All questions regarding the use of or information in the Appendix D document or the included tables should be directed to