[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR210.31]

[Page 71-72]
 
                        TITLE 49--TRANSPORTATION
 
       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 210_RAILROAD NOISE EMISSION COMPLIANCE REGULATIONS--Table of Contents
 
                    Subpart B_Inspection and Testing
 
Sec.  210.31  Operation standards (stationary locomotives at 30 meters).

    (a) For stationary locomotives at load cells:
    (1) Each noise emission test shall begin after the engine of the 
locomotive has attained the normal cooling water operating temperature 
as prescribed by the locomotive manufacturer.
    (2) Noise emission testing in idle or maximum throttle setting shall 
start after a 40 second stabilization period in the throttle setting 
selected for the test.
    (3) After the stabilization period as prescribed in paragraph (a)(2) 
of this section, the A-weighted sound level reading in decibels shall be 
observed for an additional 30-second period in the throttle setting 
selected for the test.
    (4) The maximum A-weighted sound level reading in decibels that is 
observed during the 30-second period of time prescribed in paragraph 
(a)(3) of this section shall be used for test measurement purposes.
    (b) The following data determined by any locomotive noise emission 
test conducted after December 31, 1976, shall be recorded in the 
``Remarks'' section on the reverse side of Form F 6180.49:
    (1) Location of test;
    (2) Type of test;
    (3) Date of test; and
    (4) The A-weighted sound level reading in decibels obtained during 
the passby test, or the readings obtained at idle throttle setting and 
maximum throttle setting during a load cell test.

[[Page 72]]

    (c) Any locomotive subject to this part that is found not to be in 
compliance with the Standards as a result of a passby test shall be 
subjected to a load cell test or another passby test prior to return to 
service, except that no such retest shall be required if the cause of 
the noise defect is readily apparent and is corrected by the replacement 
of defective components or by a normal maintenance or repair procedure.
    (d) The last entry recorded on Form F 6180.49 as required in 
paragraph (b) of this section shall be transcribed to a new Form FRA F 
6180.49 when it is posted in the locomotive cab.
    (e) Locomotives tested pursuant to the procedures prescribed in this 
part and in the Standards shall be considered in noncompliance wherever 
the test measurement, minus the appropriate tolerance (Sec.  210.25), 
exceeds the noise emission levels precribed in appendix A of this part.