The general train model, with three high-speedrolling-stocks and a track system, passing through a switch, is developed,considering the elasticity of the track foundation andmodeling the bogie frames as elastic bodies. The excitations caused by arailway switch and the dynamic loads acting on a railway elastic bogie frameare simulated and analyzed. By theMBS-postprocessor FEMBS$^{ -1}$, these loads are transferred back tothe FE-code, in which the stress distributions for the whole bogie aresimulated by means of the ANSYS-code, high stressed locations areidentified, and time histories for the stresses at the locations aresimulated and analyzed.The simulating results of thetrain model and one rolling-stock model, including the time histories for the stresses in the bogie frame are compared with those obtainedin the real field test. The frequency spectrums of the dynamic stressesshow that thestructural vibrations of the bogie frames in the train are differentfrom those of one rolling stock. The dynamic tensile stresses and compressive stressesin the bogie frames while the train passing through a crossing vee are allhigher in magnitude than those in a railway car. It indicates that the onerolling-stock model is only suitable for primary designs, calculations andanalyses, while the train model should be adopted in order to analyzestructural characteristics more accurately. According to the frequencyspectrums of the dynamic stresses of bogie frames, frequency domain of thestresses may be divided into three vibration zones, that is, the firstfrequency zone corresponding to the stresses while train passing a curve,the secondcorresponding to those while train passing through a crossing vee and turnout ofswitch, and the third corresponding to the natural eigenmodes ofthe elastic bogie frame.
