{ "contentStorage": "postgres", "title": "Line 4 (Tianjin Metro) · Relations", "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/relation.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" ], "conceptKind": "metro_line" }, "entities": null, "relations": [ { "id": "relation_metro_066a4372994c80d6290e1ef0", "fromId": "concept_tianjin_metro_line_4", "relationType": "stops_at", "toId": "place_tianjin_shaliunanlu", "sourceRefs": [ { "entityId": 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