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. So, for example, a film that plays in 3,000 theaters in its first week and 2,000 theaters in its second week will have had 5,000 theatrical engagements.Computer simulation of train-track-bridge interaction Note: A theatrical engagement is defined as the movie playing in a single theater for one week.
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