Subpart A—Introduction, Approvals and Reports8Subpart B—General Design Requirements11Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)31Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)69Subpart E—Specifications for Multi-Unit Tank Car Tanks (Classes DOT-106A and 110AW)20Subpart F—Specification for Cryogenic Liquid Tank Car Tanks and Seamless Steel Tanks (Classes DOT-113 and 107A)44
Regulationcurrent
49 CFR 179.20
Service equipment; protection systems.
Current as of 2026-08-18 Government source
eCFR editorial compilationAuthoritative but unofficial
If an applicable tank car specification authorizes location of filling or discharge connections in the bottom shell, the connections must be designed, constructed, and protected according to paragraphs E9.00 and E10.00 of the AAR Specifications for Tank Cars (IBR, see § 171.7 of this subchapter).#
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