The fitting coefficients are performed in more detailsin Tables 1 and 2, giving the proportion of each component including the train speed, wind speed and interaction between them for aerodynamic loads. It can be seenfrom this tables that, at a lower yaw angle 0–20°, the sideforce is mainly governed by the combination that comes from the moving train and incoming wind, but when theyaw angle ranges toward higher, the transverse wind canmake more contribution, which shows the influence ofmoving train for the side force is only represented at thelower yaw angle and the same results are found in lift force