The dynamics of moving railroad vehicles is a challenging problem of nonlinear dynamical multibody systems. Already the fundamental guidance system with the flanged steel wheelset on steel rails introduces both kinematic and dynamic nonlinearities in the equations of motion of the vehicle, but there exist also other sources of nonlinearities in moving railroad vehicles. Examples are: Nonlinear responses of suspension elements to actions, play and impacts and hysteresis effects from air springs or dry friction contact.

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