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Section §180.509: Requirements for inspection and test of specification tank cars

Below are the available interpretations and guidance for the given section. To return to the list of parts, use the Parts link above. If you do not see any guidance or interpretation information below, that means there is none available for the given part/section. Return to the search page to browse additional regulations sections.

PHMSA has published several Frequently Asked Questions (FAQ) documents on regulatory topics. Please review our FAQ documents below:

Additionally PHMSA has Hazardous Materials FAQs based on letters of interpretation on the following topics:

This section of the website provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. Below is a list of parts, identified by the part number and subject. To browse sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

A written regulatory interpretation, response to a question, or an opinion concerning a pipeline safety issue may be obtained by submitting a written request to the Office of Pipeline Safety (PHP–30), PHMSA, U.S. Department of Transportation, 1200 New Jersey Avenue SE., Washington, DC 20590–0001 or at the email address: In addition to email address, the requestor must include his or her return address and should also include a daytime telephone number. Requests should be submitted at least 120 days before the time the requestor needs a response.

Note: electronic submission is provided as alternative to the 49 CFR Part 190.11(b) mail-in requirement.

The regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to

View section 180.509 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
22-0087 Olin Corporation Daniel T. Stein View
22-0134 SMBC Rail Services LLC Dan Welch View
22-0094 AllTranstek, LLC Larry Loman View
21-0054 TCIX Rail Keenan Moore View
21-0005 Rescar Companies J. Andrew Schaffer View
20-0023R Rescar Jay G. Standish View
19-0094 Wells Fargo Rail Robert Sech View
19-0117 Railway Supply Institute (RSI) Mr. E. Michael O'Malley View
18-0036R Association of American Railroads Kenneth Dorsey View
18-0045 Wells Fargo Rail Robert Sech View
18-0036 Association of American Railroads Kenneth B. Dorsey View
13-0202 Midland Rail Services, LLC Mr. Allen Maty View
09-0046 Honeywell Ms. Claire Matlon Leader View