[Code of Federal Regulations]

[Title 40, Volume 24]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR201.24]



[Page 76-78]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 201_NOISE EMISSION STANDARDS FOR TRANSPORTATION EQUIPMENT; INTERSTATE 

RAIL CARRIERS--Table of Contents

 

                     Subpart C_Measurement Criteria

 

Sec.  201.24  Procedures for measurement at a 30 meter (100 feet) 

distance of the noise from locomotive and rail car operations and 

locomotive load cell test stands.



    (a) Microphone positions. (1) The microphone shall be located within 

the test site according to the specifications given in the test 

procedures of paragraphs (b), (c) and (d) of this section, and shall be 

positioned 1.2 meters (4 feet) above the ground. It shall be oriented 

with respect to the source in accordance with the manufacturer's 

recommendations.

    (2) The observer shall not stand between the microphone and the 

source whose sound level is being measured.

    (b) Stationary locomotive and locomotive load cell test stand tests. 

(1) For stationary locomotive and locomotive load cell test stand tests, 

the microphone shall be positioned on a line perpendicular to the track 

at a point 30 meters (100 feet) from the track centerline at the 

longitudinal midpoint of the locomotive.

    (2) The sound level meter shall be observed for thirty seconds after 

the test throttle setting is established to assure operating stability. 

The maximum sound level observed during that time shall be utilized for 

compliance purposes.

    (3) Measurement of stationary locomotive and locomotive load cell 

test stand noise shall be made with all cooling fans operating.

    (c) Rail car pass-by test. (1) For rail car pass-by tests, the 

microphone shall be positioned on a line perpendicular to the track 30 

meters (100 feet) from the track centerline.



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    (2) Rail car noise measurements shall be made when the locomotives 

have passed a distance 152.4 meters (500 feet) or 10 rail cars beyond 

the point at the intersection of the track and the line which extends 

perpendicularly from the track to the microphone location, providing any 

other locomotives are also at least 152.4 meters (500 feet) or 10 rail 

car lengths away from the measuring point. The maximum sound level 

observed in this manner which exceeds the noise levels specified in 

Sec.  201.13 shall be utilized for compliance purposes.

    (3) Measurements shall be taken on reasonably well maintained 

tracks.

    (4) Noise levels shall not be recorded if brake squeal is present 

during the test measurement.

    (d) Locomotive pass-by test. (1) For locomotive pass-by tests, the 

microphone shall be positioned on a line perpendicular to the track at a 

point 30 meters (100 feet) from the track centerline.

    (2) The noise level shall be measured as the locomotive approaches 

and passes by the microphone location. The maximum noise level observed 

during this period shall be utilized for compliance purposes.

    (3) Measurements shall be taken on reasonably well maintained 

tracks.



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[GRAPHIC] [TIFF OMITTED] TN30SE99.055





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