Identification of High-Speed Rail Ballast Flight Risk Factors and Risk Mitigation Strategies Bedini Jacobini, F., E. Tutumluer and M.R. Saat. 2013. Identification of High-Speed Rail Ballast Flight Risk Factors and Risk Mitigation Strategies. In: Proceedings of the 10th World Congress on Railway Research. Sydney, Australia. Files Identification of High-Speed Rail Ballast Flight Risk Factors and Risk Mitigation Strategies - Full Text (PDF) Categories Safety and Risk