"railbird" meaning in English

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  "etymology_text": "rail + bird",
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  "pos": "noun",
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      "glosses": [
        "A rail or similar bird"
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          "kind": "lifeform",
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          "name": "Rallids",
          "orig": "en:Rallids",
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          "ref": "2007 October 6, Charles Mcgrath, “The Happy Hustler”, in New York Times",
          "text": "He earned it one night at Chelsea Billiards in New York, where he knocked off Eddie Hubler, a.k.a. Kid Vicious, winning $4,200 from railbirds who were certain that the fat kid from Jersey had no game.",
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        "A gambler; originally specifically a horseracing enthusiast"
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        "(US, slang) A gambler; originally specifically a horseracing enthusiast"
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  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A rail or similar bird"
      ],
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        [
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