Idle speed

{
  "id": "MLC-T-ENV-013797",
  "term": "Idle speed",
  "field": "Environment",
  "term_source": "Idle Speed",
  "definition": "1. Speed, expressed as the number of revolutions of the crankshaft per unit of time (e.g., rpm), at which the engine is set to operate when not under load for purposes of propelling the locomotive.\n\n2. Speed, expressed as the number of revolutions of the crankshaft per unit of time (e.g., rpm), at which the engine is set to operate when not under load for purposes of propelling the locomotive. There are typically one or two idle speeds on a locomotive as follows:(1) Normal idle speed means the idle speed for the idle throttle-notch position for locomotives that have one throttle-notch position, or the highest idle speed for locomotives that have two idle throttle-notch positions.(2) Low idle speed means the lowest idle speed for locomotives that have two idle throttle-notch positions.\n\n3. Engine speed at which an engine governor function controls engine speed with operator demand at minimum and with minimum load applied (greater than or equal to zero). For engines without a governor function that controls idle speed, idle speed means the manufacturer-declared value for lowest engine speed possible with minimum load. This definition does not apply for operation designated as “high-idle speed.” “Warm idle speed” is the idle speed of a warmed-up engine.",
  "subject": "Regulatory activities",
  "references": [
    "40 CFR 92.2 (CFR 2013)",
    "40 CFR 1033.901 (CFR 2013)",
    "40 CFR 1065.1001 (CFR 2013)"
  ],
  "url": "https://mlchart.com/terminology/environment/idle-speed/"
}