Tornado-induced railway accidents occurred globally and the risk analysis of high-speed train in tornado-like wind fields is required, particularly in the context of the ongoing development of high-speed rail systems. To study the applicability of Burgers-Rott and Sullivan tornado models, CFD simulations are firstly carried out. It reveals that the Burgers-Rott model can effectively simulate the tangential velocity characteristics of tornado-like vortices up to the two-celled turbulent vortex stage while the Sullivan model is a suitable choice for vortices in the multi-vortex stage. Subsequent analyses delve into the behavior of the dynamic amplification factor (DAF) in tornado-like vortices. The Burgers-Rott model exhibits a higher DAF value when the passing time exceeds 1.5s whereas the dominance of the Sullivan model is evident when the passing time is less than 1.5s. Finally, a linear relationship between characteristic wind curve (CWC) and train speed is noted. This relationship manifests as the characteristic wind speed reaches approximately 30 m/s as the train speed is 150 km/h. It is also noteworthy that the CWC exhibits an upward trajectory as the translational speed of the tornado intensifies. In conclusion, this study serves as a valuable reference for assessing the operational safety of high-speed trains in tornado-like vortices.