Re: https://en.wikipedia.org/wiki/Bad_Aibling_rail_accident
What is the equation between the consequences and the human error of
this type? Since lives are irreplaceable after death the equation can
never be satisfied. Thus having another safety level is imperative. It
may be in the form of a locking system between two signalling operators
who can operate the system. Simple.
Employment will be doubled and lives saved!
See also
http://self.gutenberg.org/articles/Indusi
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