United States Department of Transportation
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Safety of High Speed Guided Ground Transportation Systems: Work Breakdown Structure
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1994-11-30
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By Bachman, J
[PDF-4.66 MB]
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Edition:Final report Jan. 1993 - Nov. 1993
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Abstract:This report provides a systems approach to the assessment, evaluation and application of high-speed guided ground transportation (HSGGT) safety criteria and
presents one potential methodology by combining a work breakdown structure (WBS)
approach with an interface evaluation methodology. By systems approach i£ is meant
that safety considerations and criteria are tied to an HSGGT structural concept and
are addressed from the highest level of a system hierarchy downward in a WBS. Safety
criteria can then be logically associated with each system structure. This is a
departure from the traditional approach of assessing safety issues individually and in
isolation of other factors.
The generic work breakdown structure (WBS) developed by The Defense Systems
Management College and outlined in its publication, System Engineering Management
Guide, was selected to structure the
complex configurations of a generic maglev system and a generic high speed rail (HSR) system. Both WBS provide a system approach to the assessment of the need for and application of safety regulations in the field of high-speed guided ground transportation (HSGGT). A typical generic WBS is composed of segments, elements, subsystems, and components, but the maglev and HSR WBS presented
in this report are defined to the subsystem level only, allowing for further lower
level definitions at a later time.
Each WBS is organized on the basis of providing mutually exclusive segments on a technological basis at least to the maximum extent that is reasonable. A methodology known as n-1 is used to describe a means to create diagrams that depict the interface between segments, elements, and subsystems. A total of 129 subsystems are identified for a generic maglev system and 118 are identified for a generic HSR system.
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