Device intended to delimit the extension of track circuits. It can be of three types: traditional type, consisting of a shape, insulating jaws and metal slats, it can be made at any existing rail junction; glued type, consisting of a piece of rail three meters long, in which it is glued with special resin, requires the execution of two cuts of rail and two welds at each insulated joint; type glued in place, specific for the hearts of manganese steel switches
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