{
  "contentStorage": "postgres",
  "title": "Line 4 (Tianjin Metro)",
  "description": "Line 4 (Tianjin Metro) is a metro line, opened on 28 December 2021, 20 km long, with 30 stations.",
  "url": "/en/concepts/tianjin-metro-line-4.html",
  "entity": {
    "customFields": [
      {
        "key": "line_opened",
        "value": "28 December 2021"
      },
      {
        "key": "line_last_extension",
        "value": "8 July 2025"
      },
      {
        "key": "line_length",
        "value": "20 km"
      },
      {
        "key": "line_stations",
        "value": "30"
      },
      {
        "key": "line_structure",
        "value": "underground"
      },
      {
        "key": "line_max_speed",
        "value": "80 km/h"
      }
    ],
    "id": "concept_tianjin_metro_line_4",
    "type": "concept",
    "title": "Line 4 (Tianjin Metro)",
    "slug": "tianjin-metro-line-4",
    "aliases": [
      "天津地铁4号线"
    ],
    "summary": "Line 4 (Tianjin Metro) is a metro line, opened on 28 December 2021, 20 km long, with 30 stations.",
    "status": "published",
    "categories": [
      "category-transit"
    ],
    "tags": [
      "tag-metro"
    ],
    "sources": [
      {
        "id": "cptond",
        "title": "CPTOND-2025 — Wang, Liang 等 (CC BY 4.0)",
        "url": "https://doi.org/10.6084/m9.figshare.29377427.v2",
        "locator": "Tianjin/tianjin_metro_routes.shp; DBF rows 10,17; status=1"
      },
      {
        "id": "wikidata",
        "title": "Wikidata Q10940016",
        "url": "https://www.wikidata.org/wiki/Q10940016"
      },
      {
        "id": "zhwiki",
        "title": "天津地铁4号线（维基百科）",
        "url": "https://zh.wikipedia.org/wiki/%E5%A4%A9%E6%B4%A5%E5%9C%B0%E9%93%814%E5%8F%B7%E7%BA%BF",
        "locator": "信息框"
      }
    ],
    "createdAt": "2026-10-25",
    "updatedAt": "2026-10-25",
    "revision": 3,
    "body": "## Overview\n\nLine 4 (Tianjin Metro) is a metro line, opened on 28 December 2021[^zhwiki], 20 km long[^zhwiki], with 30 stations[^zhwiki].",
    "url": "/concepts/tianjin-metro-line-4.html",
    "lang": "en",
    "availableLangs": [
      "zh",
      "en"
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      "id": "tag-metro",
      "slug": "metro",
      "name": "地铁",
      "description": "中国城市地铁线路、车站与运营机构。",
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      "targetTitle": "Jinjie Station",
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      ],
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      "targetUrl": "/en/places/tianjin-xinxingcun.html",
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      "targetUrl": "/en/places/tianjin-dongnanjiao.html",
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    },
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      ],
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      "targetId": "place_tianjin_hepinglu",
      "targetTitle": "Hepinglu station",
      "targetUrl": "/en/places/tianjin-hepinglu.html",
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      ],
      "label": "Stops at",
      "targetId": "place_tianjin_taichanglu",
      "targetTitle": "Taichanglu station",
      "targetUrl": "/en/places/tianjin-taichanglu.html",
      "incoming": false
    },
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      ],
      "label": "Stops at",
      "targetId": "place_tianjin_liuweilu",
      "targetTitle": "Liuweilu station",
      "targetUrl": "/en/places/tianjin-liuweilu.html",
      "incoming": false
    }
  ],
  "mentions": [
    {
      "fromId": "place_tianjin",
      "fromTitle": "天津市",
      "fromUrl": "/en/places/tianjin.html",
      "fromType": "place"
    },
    {
      "fromId": "place_tianjin_chenglindao",
      "fromTitle": "成林道站",
      "fromUrl": "/en/places/tianjin-chenglindao.html",
      "fromType": "place"
    },
    {
      "fromId": "place_tianjin_dengzhounanlu",
      "fromTitle": "登州南路站",
      "fromUrl": "/en/places/tianjin-dengzhounanlu.html",
      "fromType": "place"
    },
    {
      "fromId": "place_tianjin_dongnanjiao",
      "fromTitle": "东南角站",
      "fromUrl": "/en/places/tianjin-dongnanjiao.html",
      "fromType": "place"
    },
    {
      "fromId": "place_tianjin_hangshuanglu",
      "fromTitle": "航双路站",
      "fromUrl": "/en/places/tianjin-hangshuanglu.html",
      "fromType": "place"
    },
    {
      "fromId": "place_tianjin_hepinglu",
      "fromTitle": "和平路站",
      "fromUrl": "/en/places/tianjin-hepinglu.html",
      "fromType": "place"
    },
    {
      "fromId": "place_tianjin_jinjie",
      "fromTitle": "金街站",
      "fromUrl": "/en/places/tianjin-jinjie.html",
      "fromType": "place"
    },
    {
      "fromId": "place_tianjin_liuweilu",
      "fromTitle": "六纬路站",
      "fromUrl": "/en/places/tianjin-liuweilu.html",
      "fromType": "place"
    },
    {
      "fromId": "place_tianjin_minhangdaxue",
      "fromTitle": "民航大学站",
      "fromUrl": "/en/places/tianjin-minhangdaxue.html",
      "fromType": "place"
    },
    {
      "fromId": "place_tianjin_shaliunanlu",
      "fromTitle": "沙柳南路站",
      "fromUrl": "/en/places/tianjin-shaliunanlu.html",
      "fromType": "place"
    }
  ],
  "versions": [
    {
      "revision": 3,
      "updatedAt": "2026-10-27",
      "message": "当前版本",
      "hasSnapshot": true,
      "url": "/en/concepts/tianjin-metro-line-4/at/3.html"
    }
  ],
  "lang": "en",
  "availableLangs": [
    "zh",
    "en"
  ],
  "infoFields": [
    {
      "key": "concept_kind",
      "label": "Concept kind",
      "value": "Metro line"
    },
    {
      "key": "aliases",
      "label": "Aliases",
      "value": "天津地铁4号线"
    },
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      "key": "line_opened",
      "label": "Opened",
      "value": "28 December 2021"
    },
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      "key": "line_last_extension",
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    },
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      "label": "Stations",
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    },
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    },
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      "key": "line_max_speed",
      "label": "Maximum speed",
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  "relationCounts": [
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      "relationType": "stops_at",
      "incoming": false,
      "label": "Stops at",
      "total": 14,
      "moreUrl": "/en/concepts/tianjin-metro-line-4/relation/stops_at-out.html"
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  "mentionsTotal": 15,
  "mentionsUrl": "/en/concepts/tianjin-metro-line-4/relation/mentions.html"
}