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were commonplace, but progressively improved safety measures have resulted in a stable lower level of such incidents. A sampling of annual approximate numbers of derailments in the United States includes 3000 in 1980, 1000 in 1986, 500 in 2010, and 1000 in 2022. Although considerably less common than they were a century or even half a century ago, major incidents do still occur from time to time. Besides operator error, system failure due to aging infrastructure, often combined with constant or even increasing demand, has played a growing role

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