CFR›Title 40›Chapter I›40 CFR Part 201 Citation40 CFR Part 201ContainsSubparts Subpart A–Subpart CCorpusDaily eCFRDisplayed edition2026-10-14Last updated2026-10-14 PART 201—NOISE EMISSION STANDARDS FOR TRANSPORTATION EQUIPMENT; INTERSTATE RAIL CARRIERS Subparts Subpart A Subpart A—General Provisions Subpart B Subpart B—Interstate Rail Carrier Operations Standards Subpart C Subpart C—Measurement Criteria AuthorityNoise Control Act of 1972, sec. 17(a), 86 Stat. 1234 (42 U.S.C. 4916(a)).Source45 FR 1263, Jan. 4, 1980, unless otherwise noted.