"hopper car" meaning in English

{
  "forms": [
    {
      "form": "hopper cars",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hopper car (plural hopper 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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Vehicles",
          "orig": "en:Vehicles",
          "parents": [
            "Machines",
            "Transport",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A railroad freight car which is used to transport bulk materials in a hopper, the load being usually discharged through one or more hinged doors at the bottom of the car."
      ],
      "id": "en-hopper_car-en-noun-WC7CXXLs",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railroad",
          "railroad"
        ],
        [
          "freight car",
          "freight car"
        ],
        [
          "bulk",
          "bulk"
        ],
        [
          "material",
          "material"
        ],
        [
          "hopper",
          "hopper"
        ]
      ],
      "raw_glosses": [
        "(rail transport, US) A railroad freight car which is used to transport bulk materials in a hopper, the load being usually discharged through one or more hinged doors at the bottom of the car."
      ],
      "related": [
        {
          "word": "ballast car"
        },
        {
          "word": "chemical car"
        },
        {
          "word": "coal car"
        },
        {
          "word": "grain car"
        },
        {
          "word": "mine car"
        },
        {
          "word": "ore car"
        },
        {
          "word": "skip car"
        }
      ],
      "synonyms": [
        {
          "word": "hopper wagon"
        }
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "hopper car"
}

{
  "forms": [
    {
      "form": "hopper cars",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hopper car (plural hopper cars)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "ballast car"
    },
    {
      "word": "chemical car"
    },
    {
      "word": "coal car"
    },
    {
      "word": "grain car"
    },
    {
      "word": "mine car"
    },
    {
      "word": "ore car"
    },
    {
      "word": "skip car"
    }
  ],
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Rail transportation",
        "en:Vehicles"
      ],
      "glosses": [
        "A railroad freight car which is used to transport bulk materials in a hopper, the load being usually discharged through one or more hinged doors at the bottom of the car."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railroad",
          "railroad"
        ],
        [
          "freight car",
          "freight car"
        ],
        [
          "bulk",
          "bulk"
        ],
        [
          "material",
          "material"
        ],
        [
          "hopper",
          "hopper"
        ]
      ],
      "raw_glosses": [
        "(rail transport, US) A railroad freight car which is used to transport bulk materials in a hopper, the load being usually discharged through one or more hinged doors at the bottom of the car."
      ],
      "synonyms": [
        {
          "word": "hopper wagon"
        }
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "hopper car"
}