He Yulong is a Professor in the Faculty of Geosciences and Environmental Engineering, at Southwest Jiaotong University, China. His research focuses on rail transit environmental protection. He has published three monographs and more than 50 papers.Tao Wei is Associated Professor in the School of Chemistry and Environmental Engineering at the Sichuan University of Science and Engineering, China. Her research focuses on railway noise, wastewater treatment and soil remediation.Changgen Mei, received an PhD degree from Southwest Jiaotong University and University of Delaware Joint Doctoral Program, associate director of Department of Environmental Engineering ,School of Chemistry and Environmental Engineering , Sichuan University of Science & Engineering, mainly engaged in teaching and research in traffic noise and vibration.