"single-heading" meaning in English

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      "expansion": "single-heading (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
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          "ref": "2022 October 19, Tony Streeter, “A glimpse into UK rail's future: Europe's most powerful”, in RAIL, number 968, page 35:",
          "text": "The primary purpose of having such high power available is enabling the single-heading of heavy trains, which results \"in higher payload and lower traction costs\", says Stadler.",
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      "glosses": [
        "The haulage of a train by one locomotive."
      ],
      "id": "en-single-heading-en-noun-TC45TnSG",
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        [
          "rail transport",
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        [
          "locomotive",
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      "raw_glosses": [
        "(rail transport) The haulage of a train by one locomotive."
      ],
      "related": [
        {
          "word": "double-heading"
        },
        {
          "word": "treble-heading"
        }
      ],
      "tags": [
        "uncountable"
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      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "single-heading"
}

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      "expansion": "single-heading (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "double-heading"
    },
    {
      "word": "treble-heading"
    }
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          "ref": "2022 October 19, Tony Streeter, “A glimpse into UK rail's future: Europe's most powerful”, in RAIL, number 968, page 35:",
          "text": "The primary purpose of having such high power available is enabling the single-heading of heavy trains, which results \"in higher payload and lower traction costs\", says Stadler.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The haulage of a train by one locomotive."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
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          "locomotive"
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        "(rail transport) The haulage of a train by one locomotive."
      ],
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        "uncountable"
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        "rail-transport",
        "railways",
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  "word": "single-heading"
}