{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/westinghouse-air-brake-technologies/main/json-schema/westinghouse-air-brake-technologies-locomotive-schema.json",
  "title": "Locomotive",
  "description": "Represents a locomotive asset tracked by the Wabtec condition monitoring and fleet management platform.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique locomotive identifier within the Wabtec platform."
    },
    "roadNumber": {
      "type": "string",
      "description": "Railroad-assigned road number for the locomotive."
    },
    "model": {
      "type": "string",
      "description": "Locomotive model designation (e.g., ES44AC, ET44AH, SD70ACe)."
    },
    "manufacturer": {
      "type": "string",
      "description": "Locomotive manufacturer name."
    },
    "railroad": {
      "type": "string",
      "description": "Railroad operator owning or operating the locomotive."
    },
    "status": {
      "type": "string",
      "description": "Current operational status of the locomotive.",
      "enum": ["in-service", "out-of-service", "in-maintenance", "stored", "unknown"]
    },
    "location": {
      "type": "object",
      "description": "Current geographic location from telematics.",
      "properties": {
        "latitude": {
          "type": "number",
          "format": "double"
        },
        "longitude": {
          "type": "number",
          "format": "double"
        },
        "timestamp": {
          "type": "string",
          "format": "date-time"
        }
      }
    },
    "horsepower": {
      "type": "integer",
      "description": "Rated horsepower of the locomotive."
    },
    "engineType": {
      "type": "string",
      "description": "Engine technology type.",
      "enum": ["diesel-electric", "electric", "hybrid", "battery-electric"]
    },
    "mileage": {
      "type": "number",
      "format": "double",
      "description": "Total accumulated mileage in miles."
    },
    "fuelLevel": {
      "type": "number",
      "format": "double",
      "description": "Current fuel level as percentage of capacity."
    },
    "lastMaintenanceDate": {
      "type": "string",
      "format": "date",
      "description": "Date of the most recent maintenance event."
    },
    "nextScheduledMaintenance": {
      "type": "string",
      "format": "date",
      "description": "Date of next scheduled maintenance."
    },
    "faultCodes": {
      "type": "array",
      "description": "Active fault codes from onboard diagnostics.",
      "items": {
        "type": "string"
      }
    }
  },
  "required": ["id", "roadNumber", "railroad", "status"]
}