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The article presents a mathematical model for the study of a passenger coach hunting motion using the multibody approach. The model comprises the lateral displacement, rolling and yawing motions for the main constitutive elements: axles, bogies and case. The equation system is written applying energetic methods. The forced vibrations determined by the irregular profile of the tracks are considered. The wheel -rail contact forces are expressed using the creepage coefficients establisheddoi:10.13111/2066-8201.2011.3.4.9 fatcat:mp7hjxmep5f3pdo2anhjywcwci