{
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  "title": "Hamburger Hochbahn AG · Versions",
  "description": "The Hamburger Hochbahn AG (HHA), founded in 1911 and 100 % owned by the Free and Hanseatic City of Hamburg, operates the four lines of the Hamburg U-Bahn as well as a large part of the Hamburg bus network.",
  "url": "/en/organizations/hamburger-hochbahn/versions.html",
  "entity": {
    "id": "organization_hamburger_hochbahn",
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    "title": "Hamburger Hochbahn AG",
    "slug": "hamburger-hochbahn",
    "summary": "The Hamburger Hochbahn AG (HHA), founded in 1911 and 100 % owned by the Free and Hanseatic City of Hamburg, operates the four lines of the Hamburg U-Bahn as well as a large part of the Hamburg bus network.",
    "status": "published",
    "categories": [
      "category-transit",
      "category-urban-rail",
      "category-road-transport"
    ],
    "tags": [
      "tag-metro",
      "tag-bus",
      "tag-transit-operator"
    ],
    "sources": [
      {
        "id": "wikipedia",
        "title": "Hamburger Hochbahn — Wikipedia",
        "url": "https://de.wikipedia.org/wiki/Hamburger_Hochbahn",
        "locator": "Abschnitte Geschichte und Betriebswerke; abgerufen 2026-10-28"
      }
    ],
    "createdAt": "2026-10-28T00:00:00+08:00",
    "updatedAt": "2026-10-29T17:43:49+08:00",
    "updatedBy": "user:admin",
    "revision": 22,
    "body": "## Overview\n\nThe Hamburger Hochbahn AG (HHA) was founded on 27 May 1911 as a consortium of Siemens \u0026 Halske and AEG and is today 100 % owned by the Free and Hanseatic City of Hamburg. It is the largest local transport company in Hamburg and a core partner in the Hamburger Verkehrsverbund (hvv), of which it was a founding member in 1965. The name derives from the construction of elevated railway sections in the inner city; large parts of the network run above ground – despite the \"U\" for Untergrund (underground).\n\n## Operations\n\nThe Hochbahn operates:\n\n- The four U-Bahn lines U1, U2, U3 and U4 of the Hamburg U-Bahn with 93 stations and around 250 million passengers annually.\n- An extensive bus network with over 110 bus lines and around 1,000 buses, including the expansion of the electric bus fleet and projects on autonomous driving.\n- In planning: the new, fully automatic line U5 as well as the automation of the existing network (project U-Bahn100).\n\nFrom 1919 to 1978, the Hochbahn also operated the Hamburg tram network.\n\n## History\n\nThe Hamburger Hochbahn AG was founded on 27 May 1911 by Siemens \u0026 Halske and AEG as a consortium; the first chairman of the board was Albert Ballin. In 1918/1919 the company was reorganised as a mixed-economy enterprise and took over at the end of 1918, with the Straßen-Eisenbahn-Gesellschaft (SEG), the largest Hamburg tram operator; from 5 December 1921, the HOCHBAHN also operated Hamburg's first motor buses. Since 1965 it has been a founding member of the Hamburger Verkehrsverbund (hvv) and is wholly owned by the Free and Hanseatic City of Hamburg via the HGV Hamburger Gesellschaft für Vermögens- und Beteiligungsmanagement mbH.",
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    "orgKind": "metro_operator",
    "founded": {
      "year": 1911,
      "precision": "year",
      "display": "27. Mai 1911"
    },
    "headquartersNote": "Sitz in der Steinstraße 20, 20095 Hamburg."
  },
  "entities": null,
  "versions": [
    {
      "revision": 22,
      "updatedAt": "2026-10-31T12:41:35+08:00",
      "message": "当前版本",
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      "label": "Organization kind",
      "value": "Metro operator"
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      "value": "27. Mai 1911"
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    {
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      "label": "Headquarters",
      "value": "Sitz in der Steinstraße 20, 20095 Hamburg."
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