I manually matched STCC codes to the commodity names. It took a long time to do and I don't want anyone else to go through this again. Feel free to use this json in any use case. I would appreciate credit but it isn't required. :)
Link to where I got it from (pages 116 to 167):
https://www.stb.gov/wp-content/uploads/2021-STB-Waybill-Reference-Guide-V2.pdf- STCC_codes.json contains the commodity code and commodity name pairing of each commodity code in the Waybill Reference Guide pdf for 2021
