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A train protection system automatically applies the brakes of a train if the speed limit for a segment of track is exceeded, or if the train enters a track segment that is currently signaled with a red light (i.e. the segment should not be entered). Giving reasons for your answer, chose a reliability metric that might be used to specify the required reliability for such a system.

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The most appropriate reliability metric is Probability of Failure on demand (POFOD). This is the probability that the system will respond correctly when a request is made for service at a given point in time. This metric is used for protection systems where demands for service are intermittent and relatively infrequent over the lifetime of the system.

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