| http://www.w3.org/ns/prov#value | - This time/distance will depend upon factors such as the speed of the train, the weight and length of the train, the grade and amount of curvature of the upcoming track (which are determined using position information from the GPS receiver 130 as an index into the map database 140), braking power, braking ratios, type of brake equipment, aerodynamic drag of the train, etc.
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