"ton mile" meaning in English

{
  "forms": [
    {
      "form": "ton miles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ton mile (plural ton miles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1963 September, “French Railways' quarter-century of expansion”, in Modern Railways, page 189",
          "text": "Nevertheless, since 1938 the French National Railways' passenger traffic has risen by 60 per cent and freight traffic, in terms of ton-miles, 130 per cent.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A unit of measure expressed in number of short tons moved over a specific distance in miles."
      ],
      "id": "en-ton_mile-en-noun-tAU-nY3R",
      "links": [
        [
          "short ton",
          "short ton"
        ],
        [
          "mile",
          "mile"
        ]
      ],
      "related": [
        {
          "word": "ton mileage"
        }
      ]
    }
  ],
  "word": "ton mile"
}

{
  "forms": [
    {
      "form": "ton miles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ton mile (plural ton miles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "ton mileage"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1963 September, “French Railways' quarter-century of expansion”, in Modern Railways, page 189",
          "text": "Nevertheless, since 1938 the French National Railways' passenger traffic has risen by 60 per cent and freight traffic, in terms of ton-miles, 130 per cent.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A unit of measure expressed in number of short tons moved over a specific distance in miles."
      ],
      "links": [
        [
          "short ton",
          "short ton"
        ],
        [
          "mile",
          "mile"
        ]
      ]
    }
  ],
  "word": "ton mile"
}