# Mr. Patrick F. Reilly — Hazardous Materials Safety Interpretation

**Citation:** 06-0147  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2006-07-27

06-0147 concerning 171.7.

## Document text

<<<PAGE 1>>>

.S. Departmer
f Transportatio
400 Seventh Street, S.W.
Washington, D.C. 20590
Pipeline and Hazardous
Materials Safety Administratior
JUL 27 2006
919 Parkview Road
Mr. Patrick F. Reilly
Ref. No. 06-0147
Moscow, PA 18444
Dear Mr. Reilly:
This responds to your June 29, 2006 letter requesting clarification on § 171.7 Reference
material, materials incorporated by reference into the Hazardous Materials Regulations
(HMR; 49 CFR 171-180). Specifically, you ask whether the "Association of American
Railroads, AAR Manual of Standards and Recommended Practices, Section C-Part III,
in § 171.7 is the most current version.
Specification for Tank Cars, Specification M-1002, December 2000 edition" referenced
The AAR standard you reference was updated as of December 1, 2003. However, the
updated standard has not been incorporated by reference into the HMR. Therefore, for
purposes of the HMR, the 2000 edition referenced in § 171.7 must be used.
I hope this answers your inquiry.
Sincerely,
MESA
Chief, Standards Development
Office of Hazardous Material Standards
171.7
060147

<<<PAGE 2>>>

10
Boothe
PATRICK F. REILLY
171.7
Reference Material
06-0147
6/29/06
Mr. Robert McGuire
Associate Administrator
U.S. Department of Transportation
Pipeline and Hazardous Materials Safety Administration
400 7th Street S. W.
Washington, D.C. 20509
I have a question concerning the hazardous materials regulations and was directed to your
Dear Mr. McGuire:
office. I was informed you are the lead DOT agency for writing and maintaining the DOT
regulations for the transportation of Hazardous Materials.
In review of 49 CFR 171.7, a regulation that incorporated by references several technical
ublications. One of those publications so noted in this sections is the Association of
American Railroads, AAR Manual of Standards and Recommended Practices, Section C
Part III, Specifications for Tank Cars, Specification M-1002, December 2000 edition.
The Current edition of this publication was updated in 2003. Contained in the 2003
edition on page C-III-3, section 1.1.1, it states that this issue of the AAR Specification for
Tank Cars dated October 1, 2003, supersedes the issue dated December 1, 2000.
Yesterday, Wednesday, June 28, 2006, I called the Federal Railroad Administration and
that this was an oversight in updating the current CFR. My question is. Is this correct,
spoke to Mr. Ray Casey who is a Hazardous Material Specialist. Mr. Casey informed me
regulation and not an outdated version?
and can I assume that the current AAR Specifications for Tank Cars is referenced in the
Thank you in advance for your assistance, looking forward to your response.
Sincerely
PF. Reilly

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2006/060147.pdf>
- Source ID: `phmsa`
- SHA-256: `67541276d814e4586ddc0185f970b06b18ac3c2bcd5b474d6a228bc1e221edb0`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-24T16:44:34.248Z
- Document slug: `phmsa-interpretation-06-0147`

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