"railroad spike" meaning in English

{
  "forms": [
    {
      "form": "railroad spikes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "railroad spike (plural railroad spikes)",
      "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": [
        "A type of large nail that fixes a railway line to a sleeper."
      ],
      "id": "en-railroad_spike-en-noun-S-2k~2CZ",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "nail",
          "nail"
        ],
        [
          "railway line",
          "railway line"
        ],
        [
          "sleeper",
          "sleeper"
        ]
      ],
      "raw_glosses": [
        "(rail transport, US) A type of large nail that fixes a railway line to a sleeper."
      ],
      "synonyms": [
        {
          "word": "rail spike"
        }
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "railroad spike"
}

{
  "forms": [
    {
      "form": "railroad spikes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "railroad spike (plural railroad spikes)",
      "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": [
        "A type of large nail that fixes a railway line to a sleeper."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "nail",
          "nail"
        ],
        [
          "railway line",
          "railway line"
        ],
        [
          "sleeper",
          "sleeper"
        ]
      ],
      "raw_glosses": [
        "(rail transport, US) A type of large nail that fixes a railway line to a sleeper."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "rail spike"
    }
  ],
  "word": "railroad spike"
}