[Code of Federal Regulations]
[Title 40, Volume 18]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR92.103]

[Page 422]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 92--CONTROL OF AIR POLLUTION FROM LOCOMOTIVES AND LOCOMOTIVE ENGINES--
Table of Contents
 
                       Subpart B--Test Procedures
 
Sec. 92.103  Test procedures; overview.

    (a) This subpart contains procedures for exhaust emission tests of 
locomotives and locomotive engines. The procedures specified here are 
intended to measure brake-specific mass emissions of organic compounds 
(hydrocarbons for locomotives using petroleum diesel fuel), oxides of 
nitrogen, particulates, carbon monoxide, carbon dioxide, and smoke in a 
manner representative of a typical operating cycle.
    (b)(1) The sampling systems specified in this subpart are intended 
to collect representative samples for analysis, and minimize losses of 
all analytes.
    (i) For gaseous emissions, a sample of the raw exhaust is collected 
directly from the exhaust stream and analyzed during each throttle 
setting.
    (ii) Particulates are collected on filters following dilution with 
ambient air of a separate raw exhaust sample.
    (2) Analytical equipment is identical for all fuel types, with the 
exception of the systems used to measure organics (i.e., hydrocarbons, 
alcohols, and aldehydes); diesel-fueled and biodiesel-fueled locomotives 
Parts per million and locomotive engines require a heated, continuous 
hydrocarbon detector; natural gas-fueled locomotives and locomotive 
engines require a continuous hydrocarbon detector and a methane 
detector; alcohol-fueled locomotives and locomotive engines require a 
heated hydrocarbon detector, alcohol sampling and detection systems, and 
aldehyde sampling and detection systems. Necessary equipment and 
specifications appear in Secs. 92.105 through 92.111.
    (3) Fuel specifications for emission testing are specified in 
Sec. 92.113. Analytical gases are specified in Sec. 92.112.
    (c) The power produced by the engine is measured at each throttle 
setting.
    (d) The fuel flow rate for each throttle setting is measured in 
accordance with Sec. 92.107.
    (e) Locomotives and locomotive engines are tested using the test 
sequence as detailed in Secs. 92.124 and 92.126.
    (f) Alternate sampling and/or analytical systems may be used if 
shown to yield equivalent results, and if approved in advance by the 
Administrator. Guidelines for determining equivalency are found in 
Appendix IV of this part.
    (g) At the time of the creation of this part, essentially all 
locomotives and locomotive engines subject to the standards of this part 
were designed to use diesel fuel. Therefore, the testing provisions of 
this subpart focus primarily on that fuel. Some provisions for fuels 
other than diesel are also included. If a manufacturer or remanufacturer 
of locomotives or locomotive engines, or a user of locomotives, or other 
party wishes or intends to use a fuel other than diesel in locomotives 
or locomotive engines, it shall notify the Administrator, who shall 
specify those changes to the test procedures that are necessary for the 
testing to be consistent with good engineering practice. The changes 
made under this paragraph (g) shall be limited to:
    (1) Exhaust gas sampling and analysis;
    (2) Test fuels; and
    (3) Calculations.