sattari, sajjad, Saadat, Mohammad, Mirtalaie, Sayed Hasan, salehi, mahdi, soleimani, ali (2022). Evaluation of Sperling’s Index in Passenger and Freight Trains Under Different Speeds and Track Irregularities. *International Journal of Advanced Design and Manufacturing Technology*, 15(4), 85-94. 10.30486/admt.2023.1963242.1367