"railroad truck" meaning in English

{
  "forms": [
    {
      "form": "railroad trucks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "railroad truck (plural railroad trucks)",
      "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"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
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          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A chassis or framework-like structure underneath a railroad car to which wheel axles (and, hence, wheels) are attached through bearings. (Not to be confused with railway truck or railtruck, which are British English synonyms of railroad car)"
      ],
      "id": "en-railroad_truck-en-noun-Xy-XfRZ2",
      "links": [
        [
          "chassis",
          "chassis"
        ],
        [
          "framework",
          "framework"
        ],
        [
          "railroad car",
          "railroad car"
        ],
        [
          "wheel",
          "wheel"
        ],
        [
          "axle",
          "axle"
        ],
        [
          "bearing",
          "bearing"
        ],
        [
          "railway truck",
          "railway truck"
        ],
        [
          "railtruck",
          "railtruck"
        ]
      ],
      "raw_glosses": [
        "(US) A chassis or framework-like structure underneath a railroad car to which wheel axles (and, hence, wheels) are attached through bearings. (Not to be confused with railway truck or railtruck, which are British English synonyms of railroad car)"
      ],
      "related": [
        {
          "word": "leading truck"
        },
        {
          "word": "trailing truck"
        }
      ],
      "synonyms": [
        {
          "word": "wheel truck"
        },
        {
          "word": "truck"
        },
        {
          "tags": [
            "British",
            "English"
          ],
          "word": "bogie"
        }
      ],
      "tags": [
        "US"
      ],
      "wikipedia": [
        "Bogie#Railway cars"
      ]
    }
  ],
  "word": "railroad truck"
}

{
  "forms": [
    {
      "form": "railroad trucks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "railroad truck (plural railroad trucks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "leading truck"
    },
    {
      "word": "trailing truck"
    }
  ],
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Rail transportation"
      ],
      "glosses": [
        "A chassis or framework-like structure underneath a railroad car to which wheel axles (and, hence, wheels) are attached through bearings. (Not to be confused with railway truck or railtruck, which are British English synonyms of railroad car)"
      ],
      "links": [
        [
          "chassis",
          "chassis"
        ],
        [
          "framework",
          "framework"
        ],
        [
          "railroad car",
          "railroad car"
        ],
        [
          "wheel",
          "wheel"
        ],
        [
          "axle",
          "axle"
        ],
        [
          "bearing",
          "bearing"
        ],
        [
          "railway truck",
          "railway truck"
        ],
        [
          "railtruck",
          "railtruck"
        ]
      ],
      "raw_glosses": [
        "(US) A chassis or framework-like structure underneath a railroad car to which wheel axles (and, hence, wheels) are attached through bearings. (Not to be confused with railway truck or railtruck, which are British English synonyms of railroad car)"
      ],
      "synonyms": [
        {
          "word": "wheel truck"
        },
        {
          "word": "truck"
        },
        {
          "tags": [
            "British",
            "English"
          ],
          "word": "bogie"
        }
      ],
      "tags": [
        "US"
      ],
      "wikipedia": [
        "Bogie#Railway cars"
      ]
    }
  ],
  "word": "railroad truck"
}