The contact problems between the rigid conductor line and the pantograph in a current railway system are studied from the viewpoint of nonlinear dynamics. It is assumed that there are impact oscillations between the rigid conductor line and the pantograph under the state of contact loss. The rigid conductor line pantograph svstem is modeled with a spring-supported beam excited by an oscillating body. First, we approached as an impact problem and theoretically examined by using this model. As a result, periodical impact oscillations were shown in low moving velocities of body. Second, we employed the method of mapping to clarify impact problems, and we obtained the relationship of the state of the system at the arbitraiy impact to that at the next impact. Finally, the experiments are conducted with the simple experimental model using dimensionless parameters which are equal to the one of the analytical model.
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