Abstract
In order to prevent derailment accidents caused by gauge widening, which have occured in local railways, the authors developed a loading jig which could mesure the change of gauge when loading the lateral force between the rails. Simulating a defectiveness state of the fastening to the rail, a loading test was conducted using the jig. As a result, based on the relation between the load by the jig and the amount of the gauge widening, it is considered that we can estimate gauge widening at the time of passing of a train, and that we may judge the defectiveness of sleepers including rail fastening.
