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Obstruction Gauges are used to comply with FRA required tests of track switches. They are used to determine if a power operated switch or a hand operated switch and lock movement has been adjusted properly. Proper adjustment is deemed to occur when the switch cannot be locked up when the appropriately sized obstruction is placed between the switch point and stock rail, six inches from the end of the switch point. The design concept S&C Distribution Company has employed provides four gap gauges of standard values and in combinations that enable fast change over to values used for different tests. The design also assures more stable, self-retaining mounting to the rail during tests.