A finite element three-dimensional model has been developed to study the dynamic effect of high-speed trains on the track-embankment system using LUSAS. The rails and sleepers have been represented by thick beam elements, whereas, 8-noded hexahedral linear elements were used for the ballast and the embankment. A search area was considered as a thick shell linear quadrilateral surface element to represent the rail path. The loads were applied on the rail directly by composite axle definition to create the train. The dynamic responses of the track-embankment system, i.e., displacement and acceleration have been observed. Different California Bearing Ratio (CBR) values are considered to define the stiffness of the embankment. The graphical representations between CBR values and dynamic responses of moving train on embankment are depicted. Results indicate that at CBR = 15, peak vertical displacement is noted which decreases gradually as CBR increases. Notably, at CBR = 15, once the speed exceeds the critical speed (46 m/s = 165.6 kmph) the vertical amplitude reduces and ultimately attains a constant value = 2.4 mm, which is about 80% to that of the peak value. This tendency prevails irrespective of CBR values. Variation of support condition below the embankment is also studied by introducing different sub-grade modulus.