"single-sided" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "single-sided (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"
        }
      ],
      "examples": [
        {
          "ref": "1959 December, “New TPOs for the Western Region”, in Trains Illustrated, page 581",
          "text": "Unlike the \"West Coast Postal\" of the L.M.R., the Western Region TPO train is not turned at each end of its journey, and as the coaches with pick-up/set-down apparatus are single-sided, one coach serves the mail exchange points on the down journey, a second coach marshalled the other way round serving the up exchange points.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Having something on one side only."
      ],
      "id": "en-single-sided-en-adj-r8BLh940",
      "related": [
        {
          "word": "double-sided"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "single-sided"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "single-sided (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "double-sided"
    }
  ],
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English uncomparable adjectives"
      ],
      "examples": [
        {
          "ref": "1959 December, “New TPOs for the Western Region”, in Trains Illustrated, page 581",
          "text": "Unlike the \"West Coast Postal\" of the L.M.R., the Western Region TPO train is not turned at each end of its journey, and as the coaches with pick-up/set-down apparatus are single-sided, one coach serves the mail exchange points on the down journey, a second coach marshalled the other way round serving the up exchange points.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Having something on one side only."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "word": "single-sided"
}