| http://www.w3.org/ns/prov#value | - Besides, sensors for detecting the presence of a train are provided along each rail road extending between the stations at a predetermined distance, e.g. of 500 m, wherein the detection signals outputted from the sensors are sent to the PRCs periodically at a predetermined interval, e.g. of a few seconds, for updating the train data in the respective programmed route controllers.
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