40 C.F.R. § 201.14 Standard for retarders.
Title 40 - Protection of Environment
Effective January 15, 1984, no carrier subject to this regulation shall operate retarders that exceed an adjusted average maximum A-weighted sound level of 83 dB at any receiving property measurement location, when measured with fast meter response in accordance with Subpart C of this part. [45 FR 1263, Jan. 4, 1980; 47 FR 14709, Apr. 6, 1982]
Title 40: Protection of Environment
PART 201—NOISE EMISSION STANDARDS FOR TRANSPORTATION EQUIPMENT; INTERSTATE RAIL CARRIERS
Subpart B—Interstate Rail Carrier Operations Standards
§ 201.14 Standard for retarders.