Abstract: In this study, a full scale railway track model is d by Abaqus V6.14 program in order to implement a parametric study. Numerical simulation with 3D model adopted to simulate analysis to get the results. Thirty six cases models are investigated and simulated with include subgrade layer of 100, 70 and 60% degree of saturation at load frequency 1, 2, 4, 6, 8 and 10 Hz under two loaded amplitude 200 and 250 kN. The effect of degree saturation had established by entering the value of matric suction in the geostatic step followed by static step of soil procedure and then propagating its effect on the soil as stiffness to the next steps. The matric suction value, according to that will not be changed through the dynamic step and will be the same one that was entered as a predefined value at the initial stage. The values of strains are calculated reflecting the effect of matric suction on the stiffness of the soil without regarding to the matric suction change effect. It had been concluded that the increase of load frequency lead to increase in rate of track and this rate of increases are almost same for all degrees of saturation. While the increase of load frequency lead to increase in rate of subgrade settlement and this rate of increases was higher at the higher load amplitude and the lower degree of saturation.