1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong 999077, China
2. National Rail Transit Electrification and Automation Engineering Technology Research Center (Hong Kong Branch), The Hong Kong Polytechnic University, Kowloon, Hong Kong 999077, China
3. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
4. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China
5. School of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China