United States Department of Transportation
i
Stock modeling for railroad locomotives and marine vessels
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2004-09-01
[PDF-1.82 MB]
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Edition:Final Report; September 2003 - September 2004
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Abstract:Stock modeling is the process of estimating the number of pieces of equipment in service in a given year manufactured in each of all relevant prior years. This type of modeling is important for, among other things, estimating the rate at which new technologies might penetrate the in-service fleet and thereby achieve results such as reductions in national emissions and energy consumption. Such estimates of future results are often the basis for policy decisions regarding technology-related incentives or requirements, as well as broader policy decisions regarding energy and greenhouse gas emissions. This paper furthers the development of stock models for railroad locomotives and marine vessels by reviewing basic theoretical concepts and their application to light-duty vehicles, and attempts to use available data to develop tentative locomotive and marine vessel survival curves.
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