"power train" meaning in English

{
  "forms": [
    {
      "form": "power trains",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "power train (plural power trains)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "powertrain"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2021 January 13, David Clough, “Trans-Pennine transport transformers”, in RAIL, issue 922, page 58:",
          "text": "These three-car sets used a power train comprising two British United Traction (BUT, an alliance of Leyland Motors and AEC) 150hp diesel engines coupled to a four-speed gearbox, and two of the three cars each had one power train.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of powertrain"
      ],
      "id": "en-power_train-en-noun-rL4dB7L8",
      "links": [
        [
          "powertrain",
          "powertrain#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "power train"
}

{
  "forms": [
    {
      "form": "power trains",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "power train (plural power trains)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "powertrain"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2021 January 13, David Clough, “Trans-Pennine transport transformers”, in RAIL, issue 922, page 58:",
          "text": "These three-car sets used a power train comprising two British United Traction (BUT, an alliance of Leyland Motors and AEC) 150hp diesel engines coupled to a four-speed gearbox, and two of the three cars each had one power train.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of powertrain"
      ],
      "links": [
        [
          "powertrain",
          "powertrain#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "power train"
}