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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, explain which reliability metric you would use to specify the required reliability for such a system.

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Answer:

The most effective metric to use is the Probability of Failure on Demand .

Explanation:

The Probability of Failure on Demand  is the probability that a system will respond correctly if a request is made for the service at a given point in time.

The metrics of the protection system is used when the demands for sparse, in other words not frequent.

There are five requirements:

  • system should check for light color between the two segments
  • color of the segment is red when brakes are applied
  • speed is higher than the speed limit
  • color, train speed limit are checked
  • if the train exceeds speed and the light is red

For instance, if there are 100 trains, each having 0.001 % chance, the probability of a train failing to stop is 0.0001

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