1. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Haidian District, Beijing, China
2. School of Civil Engineering, Beijing Jiaotong University, Haidian District, Beijing, China
3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China
4. College of System Engineering, National University of Defense Technology, Changsha, China