[Code of Federal Regulations]
[Title 40, Volume 22]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR201.24]

[Page 74-76]
 
                   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

[[Page 75]]

be positioned on a line perpendicular to the track 30 meters (100 feet) 
from the track centerline.
    (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.

[[Page 76]]

[GRAPHIC] [TIFF OMITTED] TN30SE99.055


[[Page 77]]