This paper examines the basis for restricting the speed of a railway vehicle passing through a station. Since the railway vehicle runs on the rail, the vibration of the vehicle and the vibration of the rail are related to each other. Therefore, the passing speed limit of the branching machine is similar to the measuring method for the vibration characteristics generated in railway vehicles. As a result, it was found that the performance of the turnout is determined by the vibration level of the vehicle.