CFR › Title 49 › Part 179 › §179.649 CFR §179.6Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkFor procedure to be followed in making repairs or alterations, see appendix R of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter).