G & B’s Rail Mounted Circuit Controller mounts to the base of the rail, utilizing the Model 856/U-5 or Model 956/7K & 7J circuit controllers. It is an optimal choice for adding temporary point detection to dark territory switch locations for PTC. It can also be applied to standard switch layouts or swing nose frog layouts. Tie crib width must be a minimum of 13”. G&B’s Rail Mount clamps to rail sizes 115lb and higher and has a 1” clearance below the head of the stock rail. Rubber mounting washers reduces vibration and Nord-lock washers with a wire tie secures the unit to the base of the rail.