"on stream" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "on stream (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "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 October 6, Greg Morse, “A need for speed and the drive for 125”, in RAIL, number 941, page 53:",
          "text": "HSTs continued to provide sterling service during these years, so much so that when Virgin and Midland Mainline brought their new wave of high-speed diesel electric multiple units [...] on stream, many preferred the ride and comfort of the vanquished to the ride and comfort of the vanquisher.",
          "type": "quote"
        }
      ],
      "glosses": [
        "In or into operation or production."
      ],
      "id": "en-on_stream-en-adv-k6-f-So7",
      "synonyms": [
        {
          "word": "onstream"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-iːm"
    }
  ],
  "word": "on stream"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "on stream (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "English adverbs",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English uncomparable adverbs",
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:English/iːm",
        "Rhymes:English/iːm/2 syllables"
      ],
      "examples": [
        {
          "ref": "2021 October 6, Greg Morse, “A need for speed and the drive for 125”, in RAIL, number 941, page 53:",
          "text": "HSTs continued to provide sterling service during these years, so much so that when Virgin and Midland Mainline brought their new wave of high-speed diesel electric multiple units [...] on stream, many preferred the ride and comfort of the vanquished to the ride and comfort of the vanquisher.",
          "type": "quote"
        }
      ],
      "glosses": [
        "In or into operation or production."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-iːm"
    }
  ],
  "synonyms": [
    {
      "word": "onstream"
    }
  ],
  "word": "on stream"
}