Detector bar

{
  "id": "MLC-T-IND-001675",
  "term": "Detector bar",
  "field": "Industrial and trades",
  "definition": "A mechanical device formerly used at railway switches and crossings to prevent the movement of points while a train was occupying the track. It consisted of a long, thin bar positioned alongside the rail that would be depressed by the wheels of a passing train, mechanically locking the switch. Modern railway signaling systems have largely replaced detector bars with track circuits and axle counters.",
  "subject": "Rail equipment",
  "translations": {
    "de": "Gleissperre",
    "es": "barra detectora",
    "fr": "barre de détection"
  },
  "url": "https://mlchart.com/terminology/industrial/detector-bar/"
}