Displaying title 49, up to date as of 2/21/2025. Title 49 was last amended 2/14/2025. There have been changes in the last two weeks to Title 49. Choosing an item from citations and headings will bring you directly to the content. Choosing an item from full …

Navigate by entering citations or phrases (eg: 1 CFR 1.1 49 CFR 172.101 Organization and Purpose 1/1.1 Regulation Y FAR). Choosing an item from citations and headings will bring you directly to the content.

Title 49 of the Electronic Code of Federal Regulations.

The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR. Learn more about the eCFR, its status, and the editorial process.

A subject index to the Code of Federal Regulations is contained in a separate volume, revised annually as of January 1, entitled CFR I NDEX AND F INDING A IDS . This volume contains the Parallel Table of Authorities and Rules.

Title 49 was last amended 8/23/2024. § 220.309 Permitted uses; exceptions to other restrictions. Notwithstanding any other limitations in this subpart, a railroad operating employee may use the following, if that use does not interfere with any employee's performance of safety-related duties—

To view the latest eCFR version of FMCSA’s Regulations in 49 CFR Parts 300-399, click the link in the first column. To search and browse regulations using the eCFR website, use the link below. Search the eCFR

Office of Hazardous Materials Safety: For questions about transporting hazardous materials, needing clarifications of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180), or requesting a formal letter of interpretation, please go to the Hazardous Materials Information Center (HMIC) page for contact information (phone and email address).

View Title 49 on govinfo.gov; View the PDF for 49 CFR Part 172; These links go to the official, published CFR, which is updated annually. As a result, it may not include the most recent changes applied to the CFR. Learn more.

Title 49 Volume of the Electronic Code of Federal Regulations.