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Keywords: High Accuracy Global Positioning System, HA-GPS, GPS, base station, railroad, Nationwide Differential Global Positioning System, NDGPS, Positive Train Control, PTC, Vital Positive Train Control, VPTC, Differential Global Positioning System, DGPS
Keywords: High Accuracy Nationwide Differential Global Positioning System, HA-NDGPS, High Accuracy Global Positioning System, GPS, Positive Train Control, PTC
Keywords: Infrastructure, railroad ties, residual prestress force, shape factor, prestressed concrete, high speed rail
Keywords: Concrete railroad ties, bond, ASTM A1096, pullout test, transfer length, transmission length, prestressed concrete, indented wire
Keywords: Track research, track inspection, inspection, automated inspection, automation-aided inspection, railroad, track safety, safety, human factors, passenger rail, systems-theoretic process analysis, STPA, STAMP, systems-theoretic accident model and process,