"via férrea" meaning in Portugais

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions nominales en portugais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Portugais",
      "orig": "portugais",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Portugais",
  "lang_code": "pt",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en portugais du chemin de fer",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Voies de circulation en portugais",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Voie ferrée."
      ],
      "id": "fr-via_férrea-pt-noun-xnNrSnnw",
      "raw_tags": [
        "Chemin de fer"
      ],
      "topics": [
        "transport"
      ]
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "via férrea"
}

{
  "categories": [
    "Locutions nominales en portugais",
    "portugais"
  ],
  "lang": "Portugais",
  "lang_code": "pt",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Lexique en portugais du chemin de fer",
        "Voies de circulation en portugais"
      ],
      "glosses": [
        "Voie ferrée."
      ],
      "raw_tags": [
        "Chemin de fer"
      ],
      "topics": [
        "transport"
      ]
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "via férrea"
}