MR

{
  "id": "MLC-T-IND-003784",
  "term": "MR",
  "field": "Industrial and trades",
  "definition": "An abbreviation for Main Reservoir, the primary compressed air storage tank in a locomotive's air brake system. This reservoir holds air supplied by the compressor at a high pressure, typically between 130 and 140 pounds per square inch (psi). Air from the MR is then fed through a regulating valve to charge the brake pipe and supply other pneumatic devices on the locomotive.",
  "expansions": [
    "Midland"
  ],
  "subject": "Rail equipment",
  "translations": {
    "de": "MR",
    "es": "MR",
    "fr": "MR"
  },
  "url": "https://mlchart.com/terminology/industrial/mr/"
}