(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 Sec. 171.7 of this subchapter).
(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. [Amdt. 179-9, 36 FR 21343, Nov. 6, 1971, as amended at 68 FR 75763, Dec. 31, 2003]