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Signal mechanics install, maintain, and repair signal equipment. Today's signal equipment includes computerized and electronic equipment detection devices and electronic grade crossing protection. To install signals, workers travel with road crews to designated areas. They place electrical wires, create circuits, and construct railway-highway crossing signals, such as flashers and gates. When signal mechanics install new signals or signal equipment, they or other crew members may have to dig holes and pour concrete foundations for the new equipment, or they may install precast concrete foundations. Because railroad signal systems are sometimes installed in the same areas as underground fiber-optic cables, signal mechanics must be familiar with marking systems and take great care in digging.