A train is standing on a station ready to leave. The train line out of the station is a single track line, and it is used by trains driving in both directions. Several measures are in place to prevent the train from leaving the station while another train is coming in the opposite direction. The probability of the train leaving the station without the line being clear is therefore quite low, at 3.0 × 10−6 per situation. The train driver and the train conductor will experience “Train waiting at station, ready to leave” on average 10 times every working day, and they are working 220 days each year. An average passenger will experience the same situation two times on each trip and takes 440 trips each year. On average, the train carries the train driver, the train conductor, and 30 passengers when it is waiting to leave. The probability of a collision, given that the “Train drives out of station and line is not clear” is 0.5, and the probability of being killed, given that a person is on a colliding train is 0.25. (a) What is AIR for the train driver and for an average passenger? (b) What is DPM for the train driver and for an average passenger? (c) What is PLL for train collision? (d) What is average FAR-value for the train driver? Use 1850 working hours per year as exposure time.
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