Railway key

{
  "id": "MLC-T-IND-004677",
  "term": "Railway key",
  "field": "Industrial and trades",
  "definition": "A wedge, traditionally made of treated wood or spring steel, used to secure a bullhead rail in its cast-iron chair, which is spiked to a wooden sleeper. The key is driven horizontally into the gap between the rail web and the chair jaw, holding the rail firmly in a vertical position. On curved track, keys are placed on the outside of the curve to resist the lateral forces exerted by passing trains.",
  "subject": "Rail equipment",
  "translations": {
    "de": "Bahnschlüssel",
    "es": "llave de ferrocarril",
    "fr": "clé de chemin de fer"
  },
  "url": "https://mlchart.com/terminology/industrial/railway-key/"
}