"running in" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "running in (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
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          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Italian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Romanian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Spanish translations",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1945 July and August, “The Why and The Wherefore: L.N.E.R. Pacifics at Cambridge”, in Railway Magazine, page 242:",
          "text": "For years past Pacific locomotives of all classes have worked between Kings Cross and Cambridge, […] both in order usefully to fill in gaps in their long-distance rosters, and also for running-in purposes after overhaul. Before the war the 7.18 a.m. slow from Kings Cross to Cambridge was a regular running-in turn for express locomotives stationed at Kings Cross shed.",
          "type": "quote"
        },
        {
          "ref": "1960 June, “British cars go by rail: I-The L.M.R. wins new Anglo-Scottish traffic”, in Trains Illustrated, page 335:",
          "text": "[...] moreover, there are times of pressure when, to expedite deliveries, cars may be driven in what should otherwise be the running-in period at speeds that do them no good - and over long distances too.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The operating of a new engine (especially that of a motor vehicle) at less than its normal speed until proper working has been established."
      ],
      "id": "en-running_in-en-noun-fFohZH9Q",
      "links": [
        [
          "operating",
          "operating"
        ],
        [
          "new",
          "new"
        ],
        [
          "engine",
          "engine"
        ],
        [
          "speed",
          "speed"
        ]
      ],
      "tags": [
        "uncountable"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "operation of a new engine for testing",
          "word": "sisäänajo"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "operation of a new engine for testing",
          "tags": [
            "masculine"
          ],
          "word": "rodage"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "operation of a new engine for testing",
          "tags": [
            "masculine"
          ],
          "word": "rodaggio"
        },
        {
          "code": "ro",
          "lang": "Romanian",
          "sense": "operation of a new engine for testing",
          "tags": [
            "neuter"
          ],
          "word": "rodaj"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "operation of a new engine for testing",
          "tags": [
            "masculine"
          ],
          "word": "rodaje"
        }
      ]
    }
  ],
  "word": "running in"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "running in (uncountable)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English multiword terms",
        "English nouns",
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        "English uncountable nouns",
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        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with French translations",
        "Terms with Italian translations",
        "Terms with Romanian translations",
        "Terms with Spanish translations"
      ],
      "examples": [
        {
          "ref": "1945 July and August, “The Why and The Wherefore: L.N.E.R. Pacifics at Cambridge”, in Railway Magazine, page 242:",
          "text": "For years past Pacific locomotives of all classes have worked between Kings Cross and Cambridge, […] both in order usefully to fill in gaps in their long-distance rosters, and also for running-in purposes after overhaul. Before the war the 7.18 a.m. slow from Kings Cross to Cambridge was a regular running-in turn for express locomotives stationed at Kings Cross shed.",
          "type": "quote"
        },
        {
          "ref": "1960 June, “British cars go by rail: I-The L.M.R. wins new Anglo-Scottish traffic”, in Trains Illustrated, page 335:",
          "text": "[...] moreover, there are times of pressure when, to expedite deliveries, cars may be driven in what should otherwise be the running-in period at speeds that do them no good - and over long distances too.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The operating of a new engine (especially that of a motor vehicle) at less than its normal speed until proper working has been established."
      ],
      "links": [
        [
          "operating",
          "operating"
        ],
        [
          "new",
          "new"
        ],
        [
          "engine",
          "engine"
        ],
        [
          "speed",
          "speed"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "operation of a new engine for testing",
      "word": "sisäänajo"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "operation of a new engine for testing",
      "tags": [
        "masculine"
      ],
      "word": "rodage"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "operation of a new engine for testing",
      "tags": [
        "masculine"
      ],
      "word": "rodaggio"
    },
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "operation of a new engine for testing",
      "tags": [
        "neuter"
      ],
      "word": "rodaj"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "operation of a new engine for testing",
      "tags": [
        "masculine"
      ],
      "word": "rodaje"
    }
  ],
  "word": "running in"
}