1. Ph.D. Student, School of Transportation Science and Engineering, Beihang Univ., 37 Xueyuan Rd., Haidian District, Beijing 100191, China. ORCID: .
2. Assistant Researcher, School of Transportation Science and Engineering, Beihang Univ., 37 Xueyuan Rd., Haidian District, Beijing 100191, China; China Academy of Railway Sciences Co., Ltd., 2 Daliushu Rd., Haidian District, Beijing 100081, China.
3. Professor, School of Transportation Science and Engineering, Beihang Univ., 37 Xueyuan Rd., Haidian District, Beijing 100191, China.
4. Professor, Dept. of Civil and Mineral Engineering, Univ. of Toronto, 35 St. George St., Toronto, ON, Canada M5S 1A4 (corresponding author). ORCID: .