1. School of Traffic and Transportation, Beijing Jiaotong University, Beijing, People’s Republic of China
2. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, People’s Republic of China
3. School of Public Administration, Renmin University of China, Beijing, People’s Republic of China
4. Key Laboratory of Transport Industry of Comprehensive Transportation Theory, Beijing Jiaotong University, Ministry of Transport, Beijing, People’s Republic of China