1. College of Urban Rail Transit and Logistics, Beijing Union University, Beijing, People’s Republic of China
2. Transportation Institute, Inner Mongolia University, Hohhot, People’s Republic of China
3. Key Laboratory of Transportation Industry of Automotive Transportation Safety Enhancement Technology, Chang'an University, Xi'an, People’s Republic of China
4. Passenger Transport Department, China Railway Hohhot Group Co., Ltd., Hohhot, People’s Republic of China