1. Assistant Professor, Dept. of Rail Transportation Engineering, School of Railway Engineering, Iran Univ. of Science and Technology, Tehran, Iran (corresponding author).
2. Assistant Professor, Dept. of Rail Transportation Engineering, School of Railway Engineering, Iran Univ. of Science and Technology, Tehran, Iran.
3. Sharif Univ. of Technology, Azadi St., Tehran, Iran.
4. Iran Univ. of Science and Technology, Narmak, Tehran, Iran.