1. Ph.D. Candidate, School of Civil Engineering and Built Environment, Faculty of Science and Engineering, Queensland Univ. of Technology, Brisbane, QLD 4001, Australia.
2. Ph.D. Candidate, Center for Railway Engineering, Central Queensland Univ., Rockhampton 4702, Australia.
3. Professor, School of Civil Engineering and Built Environment, Faculty of Science and Engineering, Queensland Univ. of Technology, Brisbane, QLD 4001, Australia (corresponding author).