publication Conference Paper Alsabhan, A., Fratta, D., and Tinjum, J., 2015, Evaluation of Railway Track Substructure using Ground Penetrating Radar Coupled with Time Domain Reflectometry. In From Fundamentals to Applications in Geotechnics: Proceedings of the 15th Pan-American more of publication Warning System and Inspection for Maintenance of Freight Railways Experimental Monitoring of Geotechnical Response of Railway Track 2016 Alsabhan, A., Fratta, D., and Tinjum, J., 2015, Evaluation of Railway Track Substructure using Ground Penetrating Radar Coupled with Time Domain Reflectometry. In From Fundamentals to Applications in Geotechnics: Proceedings of the 15th Pan-American