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This paper considers a track-vehicle-human body 54 degrees of freedom (DoF) system formulated using Lagrange’s method out of which 4 DoF to track system, 40 DoF to rail vehicle system and 10 DoF to lumped parameter bio-dynamic human body system are assigned. Stationary random track irregularities are measured with Track Recording Car and represented by Power Spectral Density functions using Fast Fourier Transformation. The formulated model is validated by comparing the results of accelerations analysis with the same determined through experimental measurements. The vehicle ride comfort is determined at the passenger seat based on standards specified in annexure ISO 2631-1. The vertical seat to head and vertical back support to head transmissibility of the human body model in seated backrest position is evaluated and validated through past reported studies.