---
kind: "unit"
title: "49"
title_heading: "Transportation"
key: "subtB/chI/subchC/part179"
level: "part"
label: "Part 179"
heading: "Specifications for Tank Cars"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/49/subtB-chI-subchC-part179"
sections_count: 183
---

# Part 179 — Specifications for Tank Cars

Title 49 C.F.R. — Transportation › Subtitle B — Other Regulations Relating to Transportation › Chapter I — Pipeline and Hazardous Materials Safety Administration, Department of Transportation › Subchapter C — Hazardous Materials Regulations

## Contents

- [Subpart A — Introduction, Approvals and Reports](/cfr/49/subtB-chI-subchC-part179-subpartA.md)
- [Subpart B — General Design Requirements](/cfr/49/subtB-chI-subchC-part179-subpartB.md)
- [Subpart C — Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)](/cfr/49/subtB-chI-subchC-part179-subpartC.md)
- [Subpart D — Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)](/cfr/49/subtB-chI-subchC-part179-subpartD.md)
- [Subpart E — Specifications for Multi-Unit Tank Car Tanks (Classes DOT-106A and 110AW)](/cfr/49/subtB-chI-subchC-part179-subpartE.md)
- [Subpart F — Specification for Cryogenic Liquid Tank Car Tanks and Seamless Steel Tanks (Classes DOT-113 and 107A)](/cfr/49/subtB-chI-subchC-part179-subpartF.md)