This paper is focused on the vehicle dynamics caused by the forces exchanged,udthrough buffers and draw gears, by consecutive vehicles on a curve. The results haveudbeen obtained by adding a buffers/draw gears contact model on an existingudmultibody code, previously developed by the authors. The multibody code managesudrigid bodies connected by elastic and rigid constraints; the wheel/rail contact modeludis three dimensional and employs an elastic constraint among wheel and rail. Theudwheel/rail contact is managed by means of a numerical model called TOAM (thirdudorder approximation method). Numerical tests and experimental validations of theudproposed model are here presented, considering a train made by three vehicles,udrunning on an S shaped curve, subjected to parametric compressive forces.
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