United States Department of Transportation
i
Measurement of locomotive head end power engine fuel and emissions : draft final report.
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2015-09-01
[PDF-1.47 MB]
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Edition:Draft final report
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Abstract:In the U.S., there were more than 5,000 commuter rail diesel locomotives in use in 2011. Many of these have head end
power (HEP) engines that provide power for hotel services in the passenger cars. The North Carolina Department of
Transportation owns six diesel passenger locomotives that have recently replaced HEP engines. The general goal of this work
is to quantify the in-use emission rates of these engines on ultra low sulfur diesel (ULSD) fuel and evaluate the effect of soybased
B20 biodisel fuel on each engine. The specific research objectives are to: (1) evaluate the effect of engine load on
emission rates of CO, HC, NOx, and PM; (2) compare B20 versus ULSD with respect to emission rates of CO, HC, NOx, and PM;
(3) compare to emission standards taking into account differences in measurement methods; (4) evaluate the inter-engine
variability in emission rates; and (5) estimate an emission inventory of CO, HC, NOx, and PM for the HEP engines. As
expected, fuel use and emission rates are sensitive to engine load. Cycle average PM emission rates were 20% lower for B20
than for ULSD, with no significant measured change in emission rates of other pollutants.
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