Online animation of motion and plots of dynamical performances are available during simulation. Mechanical systems are described by means of representing them as systems of rigid bodies connected by various kinematical pairs and force elements, so-called multibody systems. The program is oriented to practical engineers, students and teachers, in other words it is oriented to all people who are involved in problems of dynamics of machines and mechanisms. Program package "Universal Mechanism" is intended for simulation of kinematics and dynamics of planar and spatial mechanical systems. Comparison of the simulation results with experimental data is given. Test case of simulation of suburban 6-car train on a flexible railway track and three sections of U-like flexible railway bridge of 30 m each is shown. Vertical response of the track model is verified through comparison with experimental data. The foundation (bridge, tunnel, overpass) is considered as a flexible multibody system simulated using finite element method. Two rails modelled as Timoshenko beams are discretely supported on the sleepers through the railpads and fasteners, that are modelled as nonlinear force elements. The track model is considered as a periodic 3D structure consisting of rails, pads and sleepers on a flexible foundation. Railway vehicles are considered as multibody systems that include rigid or flexible bodies, joints and force elements. The aim of the paper is to present the approach for simulation of dynamics of the systems consisting of railway vehicle, flexible track and flexible foundation. Computer simulation of train-track-bridge interaction
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