"train oil" meaning in English

{
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        "1": "en",
        "2": "train",
        "3": "oil",
        "id1": "oil",
        "t1": "train oil"
      },
      "expansion": "train (“train oil”) + oil",
      "name": "af"
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      "args": {
        "1": "en",
        "2": "nl",
        "3": "traanolie",
        "4": "",
        "5": "whale oil",
        "nocap": "1"
      },
      "expansion": "partial calque of Dutch traanolie (“whale oil”)",
      "name": "partial calque"
    }
  ],
  "etymology_text": "From train (“train oil”) + oil, partial calque of Dutch traanolie (“whale oil”). See further etymology at train.",
  "forms": [
    {
      "form": "train oils",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "train oil (countable and uncountable, plural train oils)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
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          "langcode": "en",
          "name": "Whaling",
          "orig": "en:Whaling",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Oil obtained from the blubber of marine mammals, especially whale oil."
      ],
      "id": "en-train_oil-en-noun-q~VGu7m~",
      "links": [
        [
          "Oil",
          "oil"
        ],
        [
          "obtain",
          "obtain"
        ],
        [
          "blubber",
          "blubber"
        ],
        [
          "marine mammal",
          "marine mammal"
        ],
        [
          "whale oil",
          "whale oil"
        ]
      ],
      "related": [
        {
          "word": "trainy"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "train oil"
}

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  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "train",
        "3": "oil",
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        "t1": "train oil"
      },
      "expansion": "train (“train oil”) + oil",
      "name": "af"
    },
    {
      "args": {
        "1": "en",
        "2": "nl",
        "3": "traanolie",
        "4": "",
        "5": "whale oil",
        "nocap": "1"
      },
      "expansion": "partial calque of Dutch traanolie (“whale oil”)",
      "name": "partial calque"
    }
  ],
  "etymology_text": "From train (“train oil”) + oil, partial calque of Dutch traanolie (“whale oil”). See further etymology at train.",
  "forms": [
    {
      "form": "train oils",
      "tags": [
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      "expansion": "train oil (countable and uncountable, plural train oils)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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    {
      "word": "trainy"
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        "en:Whaling"
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      "glosses": [
        "Oil obtained from the blubber of marine mammals, especially whale oil."
      ],
      "links": [
        [
          "Oil",
          "oil"
        ],
        [
          "obtain",
          "obtain"
        ],
        [
          "blubber",
          "blubber"
        ],
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          "marine mammal",
          "marine mammal"
        ],
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          "whale oil",
          "whale oil"
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      "tags": [
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  "word": "train oil"
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