https://xn--80abla7dhnr.xn--p1ai/%d0%b2-%d1%81%d0%bb%d1%83%d1%87%d0%b0%d0%b5-%d0%bd%d0%b0%d1%80%d1%83%d1%88%d0%b5%d0%bd%d0%b8%d1%8f-%d1%86%d0%b5%d0%bb%d0%be%d1%81%d1%82%d0%bd%d0%be%d1%81%d1%82%d0%b8-%d1%80%d0%b5%d0%bb%d1%8c%d1%81/
В случае нарушения целостности рельсовой цепи