1. Assistant Professor, Dept. of Civil Engineering, Univ. of Tokyo, Tokyo 113-8656, Japan (corresponding author). ORCID: .
2. Graduate Student, Dept. of Civil Engineering, Univ. of Tokyo, Tokyo 113-8656, Japan.
3. Project Assistant Professor, Dept. of Civil Engineering, Univ. of Tokyo, Tokyo 113-8656, Japan.
4. Professor, Dept. of Civil Engineering, Univ. of Tokyo, Tokyo 113-8656, Japan.
5. Project Associate Professor, Dept. of Civil Engineering, Univ. of Tokyo, Tokyo 113-8656, Japan.
6. Senior Researcher, Track Technology Division, Railway Technical Research Institute, Tokyo 185-8540, Japan.