Dynamics and loading of railway tank cars transporting liquid cargo are investigated. The approach based on the mechanical-pendulum analogy for the liquid cargo mobility simulation is proposed. Hydrodynamic parameters of the mechanical analogy are determined using the solution of the boundary-value problem for the liquid cargo vibrations in a cavity with the tank boiler shape. The fitting of the developed mathematical models is proved by comparison of calculated results and test data. Vibration characteristics and loading of tank-cars under their shunt collisions and motion along straight and curved track in trains are evaluated. It is shown that as a rule the liquid cargo mobility has an essential influence on tank dynamic properties.

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A mathematical model to estimate the dynamic coefficients of a moving freight train is given; an approach is used in which some train vehicles are represented by simplified calculation schemes and other vehicles are represented in detail by taking into account their design and the features of the transported cargo. The train motion along track of different shapes and in various operational modes (with constant and variable speeds) is modelled. Some simulation results are presented.

A mathematical model of conventional freight car motion with constant speed is developed taking the work of brake equipment into account. The influence of freight car conventional brake rig on the vehicle dynamics at motion is studied. The results obtained at the computer simulation have shown that in some cases brake equipment can worsen the car dynamics.

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