1. Senior Lecturer, Railway and Civil Engineering, Birmingham Centre for Railway Research and Education, School of Engineering, Univ. of Birmingham, Birmingham B15 2TT, UK. ORCID: .
2. Ph.D. Student, School of Civil Engineering, Univ. of Birmingham, Birmingham B15 2TT, UK; Lecturer, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia (corresponding author). ORCID: .
3. Engineer, Public Transport, Land Transport Authority of Singapore, 1 Hampshire Rd., Singapore 219428.