"well car" meaning in English

{
  "forms": [
    {
      "form": "well cars",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "well car (plural well cars)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "an open low-sided freight car with a lowered body."
      ],
      "id": "en-well_car-en-noun-pki83Czn",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "open",
          "open"
        ],
        [
          "low-sided",
          "low-sided"
        ],
        [
          "freight car",
          "freight car"
        ]
      ],
      "raw_glosses": [
        "(rail transport, US) an open low-sided freight car with a lowered body."
      ],
      "synonyms": [
        {
          "word": "well wagon"
        }
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "well car"
}

{
  "forms": [
    {
      "form": "well cars",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "well car (plural well cars)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Rail transportation"
      ],
      "glosses": [
        "an open low-sided freight car with a lowered body."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "open",
          "open"
        ],
        [
          "low-sided",
          "low-sided"
        ],
        [
          "freight car",
          "freight car"
        ]
      ],
      "raw_glosses": [
        "(rail transport, US) an open low-sided freight car with a lowered body."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "well wagon"
    }
  ],
  "word": "well car"
}