1. Assistant Professor, Dept. of Civil Engineering, National Taiwan Univ., Rm 313, Civil Engineering Bldg, No 1, Roosevelt Rd, Sec 4, Taipei, 10617, Taiwan (corresponding author).
2. Director and Professor, "Rail Transportation and Engineering Center—RailTEC, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana–Champaign, 1203 Newmark Lab, MC-250, 205 N. Mathews Ave., Urbana, IL 61801.