StacksVerified U.S. regulatory reference

49 CFR §179.220-26

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)The outer shell, or the jacket if the outer shell is insulated, must be stenciled in compliance with AAR Specifications for Tank Cars, appendix C (IBR, see § 171.7 of this subchapter).
  2. (b)Stenciling must be applied on both sides of the outer shell or jacket near the center in letters and figures at least 1 1/2 inches high to indicate the safe upper temperature limit, if applicable, for the inner tank, insulation, and the support system.