1. State Key Laboratory of Rail Traffic Control and Safety and the School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China
2. The Polytechnic School, Arizona State University, Mesa, AZ, USA
3. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, China
4. H. Milton Stewart School of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta, GA, USA