"double-head" meaning in English

{
  "forms": [
    {
      "form": "double-heads",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "double-heading",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "double-headed",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "double-headed",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double-head (third-person singular simple present double-heads, present participle double-heading, simple past and past participle double-headed)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              163,
              174
            ]
          ],
          "ref": "1961 June, “Motive Power Miscellany: Southern Region”, in Trains Illustrated, page 380:",
          "text": "For an excursion organised by the publishers of this journal to Eastleigh and Ashford on April 5, Class T9 4-4-0 No. 30117 and E1 4-4-0 No. 31019 were provided to double-head a special from Charing Cross to Ashford via Maidstone East.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To haul a train with two locomotives at the head end."
      ],
      "id": "en-double-head-en-verb-r09qd8ja",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "haul",
          "haul"
        ],
        [
          "train",
          "train"
        ],
        [
          "locomotive",
          "locomotive"
        ]
      ],
      "raw_glosses": [
        "(rail transport) To haul a train with two locomotives at the head end."
      ],
      "related": [
        {
          "word": "double-header"
        },
        {
          "tags": [
            "noun"
          ],
          "word": "double-heading"
        }
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "double-head"
}

{
  "forms": [
    {
      "form": "double-heads",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "double-heading",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "double-headed",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "double-headed",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "double-head (third-person singular simple present double-heads, present participle double-heading, simple past and past participle double-headed)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "double-header"
    },
    {
      "tags": [
        "noun"
      ],
      "word": "double-heading"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Rail transportation"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              163,
              174
            ]
          ],
          "ref": "1961 June, “Motive Power Miscellany: Southern Region”, in Trains Illustrated, page 380:",
          "text": "For an excursion organised by the publishers of this journal to Eastleigh and Ashford on April 5, Class T9 4-4-0 No. 30117 and E1 4-4-0 No. 31019 were provided to double-head a special from Charing Cross to Ashford via Maidstone East.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "To haul a train with two locomotives at the head end."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "haul",
          "haul"
        ],
        [
          "train",
          "train"
        ],
        [
          "locomotive",
          "locomotive"
        ]
      ],
      "raw_glosses": [
        "(rail transport) To haul a train with two locomotives at the head end."
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "double-head"
}