United States Department of Transportation
i
Risk evaluation framework and selected metrics for tank cars carrying hazardous materials.
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2015-05-01
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[PDF-1.25 MB]
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Abstract:This report presents an analysis of train accident and hazmat release data to quantify the likelihood of a hazmat release. The harm caused
by a hazmat release is characterized as the end result of a chain of events, with each link in the chain being characterized by risk metrics
that determine likelihood of occurrence.
The chain of events is typically comprised of the following: 1) Freight train accident (due to an infrastructure or equipment defect)
failure of signal or communications equipment, human error, or miscellaneous cause; 2) One or more freight cars derailed in accident, as
a function of accident type, train speed, etc.; 3) Hazmat tank cars among derailed cars, depending on hazmat car routing practice; 4)
Derailed hazmat tank car releases following a train accident; and 5) Harm to people, property, and/or the environment from exposure to
released hazmat.
Analysis and findings in this report will provide regulatory, industry, and general public stakeholders a better understanding of the “chain
of events” leading to a hazmat release from a tank car, the impact of risk reduction measures that can be applied at different links along
the chain of events, and a quantifiable risk model representing the chain of events leading to a hazmat release.
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