"trailable" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "trail",
        "3": "able"
      },
      "expansion": "trail + -able",
      "name": "suffix"
    }
  ],
  "etymology_text": "From trail + -able.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "trailable (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -able",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
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          "source": "w"
        }
      ],
      "glosses": [
        "Of a system of points: arranged so that the train may run through them in a trailing direction, even if it is not set for that route."
      ],
      "id": "en-trailable-en-adj-Jxx-jwqt",
      "raw_glosses": [
        "(railways) Of a system of points: arranged so that the train may run through them in a trailing direction, even if it is not set for that route."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "railways",
        "transport"
      ],
      "wikipedia": [
        "Facing and trailing"
      ]
    }
  ],
  "word": "trailable"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "trail",
        "3": "able"
      },
      "expansion": "trail + -able",
      "name": "suffix"
    }
  ],
  "etymology_text": "From trail + -able.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "trailable (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms suffixed with -able",
        "English uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Of a system of points: arranged so that the train may run through them in a trailing direction, even if it is not set for that route."
      ],
      "raw_glosses": [
        "(railways) Of a system of points: arranged so that the train may run through them in a trailing direction, even if it is not set for that route."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "railways",
        "transport"
      ],
      "wikipedia": [
        "Facing and trailing"
      ]
    }
  ],
  "word": "trailable"
}