The vibration of overhead contact line caused by a patograph passing through an overlap section propagates on the overhead contact line and reflects at an anchor mast. The reflection wave thus generated returns to the pantograph and worsens the performance of current collection. To reduce the reflection wave with a damper, we used a model to calculate the constant and installation point for the damper, which were examined with a pantograph/catenary simulation program to prove that the installation of a damper decreased the contact loss ration and contact force fluctuations. This paper introduces the simulation that uses the results of theoretical calculation to reduce the reflection wave using a damper, evaluates the effectiveness of the damper from the viewpoint of contact loss ratio and contact force fluctuations.