Potential scenarios of concern for high speed rail operations
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2011-03-16
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Abstract:Currently, multiple operating authorities are proposing the ; introduction of high-speed rail service in the United States. ; While high-speed rail service shares a number of basic ; principles with conventional-speed rail service, the operational ; requirements on a high-speed rail system are typically more ; demanding than those for conventional-speed operations. The ; operating environment will require specialized maintenance ; and inspection procedures, enhanced protection or gradeseparation ; of highway-rail crossings, effective separation of ; other rail traffic, and detection of potential hazards along the ; track to help ensure the safety of the system. With the required ; implementation of positive train control (PTC) by passengercarrying ; rail operators, the frequency and/or severity of several ; types of railroad accidents can be decreased. While all of these ; measures will contribute to the overall system safety, incidents ; that pose a threat to passenger and crew safety may still occur ; that cannot be prevented through the design of the operating ; environment alone. It is important to consider these types of ; incidents when selecting the rail vehicles for use in a particular ; operation, and include appropriate crashworthiness and ; occupant protection measures. ; This paper presents a series of example scenarios of some of ; the potential hazards that may affect the safe operation of highspeed ; passenger trains in the United States. These situations ; are drawn from actual accidents that have occurred in the U.S. ; and abroad. The scenarios provide a starting point for ; discussing system safety features, which includes vehicle ; crashworthiness and occupant protection features. ; As an operating environment may be designed to limit the ; likelihood of certain types of incidents from occurring, three ; different hypothetical high-speed operating environments are ; discussed in this paper. While the number of potential ; scenarios varies with each operating environment, in all ; environments it is important to consider the need for a train’s ; crashworthiness features to mitigate the consequences of ; potential incidents.
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