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This paper ptxsents the results of dynamic analyses conducted to investigate the performance of a rnil vehicle system consisting of a passenger car, an inenial measurement unlt for measuring accelerations related to the dynamic movement of the vehicle and for measuring the tilting angle of the car body, a digital control unit, and actuators to reduce the accelelations felt by the passengers. The control strategies are described. The method of multibody systems has been used to design the control systems. The nonlinear dynamics of a vinual vehicle system has been analyzed on the computer synchronously to the hardware realization of the vehicle system. The paper focuses on how advnnced software tools can be applied by the rail vehicle engineer for des~gning advanced rail vehicle suspensions and performing vehicle system dynamic analyses.