"rainbow era" meaning in English

{
  "etymology_text": "From the varied, colorful appearance of multiple liveries in one consist.",
  "forms": [
    {
      "form": "rainbow eras",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rainbow era (plural rainbow eras)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "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"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2012 February 15, Tadman, “Ocean View in Rainbow Era”, in Railroad.net:",
          "text": "Amtrak's Rainbow Era was the first few years where consists were multi-colored because many legacy carriers' former rolling stock was mixed together and not yet painted for Amtrak.",
          "type": "quote"
        },
        {
          "ref": "2021, “A Brief History of Amtrak Paint Schemes and Liveries”, in Amtrak:",
          "text": "We have come a long way since that “rainbow era” of using hand-me-down equipment.",
          "type": "quote"
        },
        {
          "ref": "2022 May 30, markm, “Amtrak in a movie”, in AZL Forum:",
          "text": "That was the rainbow era when much of Amtrak was still running in the original roads’ paint until 1974.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A period in the early 1970s when Amtrak operated a fleet of used equipment that still carried the paint schemes of their previous owners."
      ],
      "id": "en-rainbow_era-en-noun-pETGVgii",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "Amtrak",
          "Amtrak"
        ]
      ],
      "raw_glosses": [
        "(rail transport, informal, US) A period in the early 1970s when Amtrak operated a fleet of used equipment that still carried the paint schemes of their previous owners."
      ],
      "tags": [
        "US",
        "informal"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "rainbow era"
}

{
  "etymology_text": "From the varied, colorful appearance of multiple liveries in one consist.",
  "forms": [
    {
      "form": "rainbow eras",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rainbow era (plural rainbow eras)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Rail transportation"
      ],
      "examples": [
        {
          "ref": "2012 February 15, Tadman, “Ocean View in Rainbow Era”, in Railroad.net:",
          "text": "Amtrak's Rainbow Era was the first few years where consists were multi-colored because many legacy carriers' former rolling stock was mixed together and not yet painted for Amtrak.",
          "type": "quote"
        },
        {
          "ref": "2021, “A Brief History of Amtrak Paint Schemes and Liveries”, in Amtrak:",
          "text": "We have come a long way since that “rainbow era” of using hand-me-down equipment.",
          "type": "quote"
        },
        {
          "ref": "2022 May 30, markm, “Amtrak in a movie”, in AZL Forum:",
          "text": "That was the rainbow era when much of Amtrak was still running in the original roads’ paint until 1974.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A period in the early 1970s when Amtrak operated a fleet of used equipment that still carried the paint schemes of their previous owners."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "Amtrak",
          "Amtrak"
        ]
      ],
      "raw_glosses": [
        "(rail transport, informal, US) A period in the early 1970s when Amtrak operated a fleet of used equipment that still carried the paint schemes of their previous owners."
      ],
      "tags": [
        "US",
        "informal"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "rainbow era"
}