49 C.F.R. § 210.33 Operation standards (switcher locomotives, load cell test stands, car coupling operations, and retarders).
Title 49 - Transportation
(a) Measurement on receiving property of the noise emission levels from switcher locomotives, load cell test stands, car coupling operations, and retarders shall be performed in accordance with the requirements of 40 CFR part 201 and §210.25 of this part. (b) These sources shall be considered in noncompliance whenever the test measurement, minus the appropriate tolerance (§210.25), exceeds the noise emission levels prescribed in appendix A of this part.
Title 49: Transportation
PART 210—RAILROAD NOISE EMISSION COMPLIANCE REGULATIONS
Subpart B—Inspection and Testing
§ 210.33 Operation standards (switcher locomotives, load cell test stands, car coupling operations, and retarders).