1. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong Univ., Beijing 100044, China; Dept. of Urban Rail, Tianjin Railway Technical and Vocational College, Tianjin 300240, China.
2. Professor, State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong Univ., Beijing 100044, China (corresponding author).
3. Ph.D. Student, School of Traffic and Transportation, Beijing Jiaotong Univ., Beijing 100044, China.
4. Senior Engineer, Beijing Municipal Commission of Transport, Beijing 100073, China.