1. Amini, A., Entezami, M., Papaelias, M., 2016. Onboard detection of railway axle bearing defects using envelope analysis of high frequency acoustic emission signals. Case Studies in Nondestructive Testing and Evaluation, 6, pp. 8–16.
2. Andani, M.T., Ahmadian, M., Munoz, J., O’Connor, T., Ha, D., 2015, March. On the application of LIDAR sensors for track geometry monitoring. In 2015 Joint Rail Conference (pp. V001T01A004-V001T01A004). American Society of Mechanical Engineers.
3. Uncertainty in rail-track geometry degradation: Lisbon-Oporto line case study;Andrade;J. Transport. Eng.,2011
4. Association of American Railroads (AAR), 2018. Overview of America's Freight Railroads, October 2018.
5. Association of American Railroads (AAR), 2019. Freight Rail's Safety Record. https://www.aar.org/issue/freight-rail-safety-record/, Accessed by May 2019.