U4 (Berlin U-Bahn) · Versions
URL: https://knowledge.ivjn.us/en/concepts/ubahn-berlin-u4/versions.html

With 2.9 km and five stations, the U4 is the shortest line of the Berlin U-Bahn; it was opened on 1 December 1910 as Germany's first municipal U-Bahn and connects Nollendorfplatz with Innsbrucker Platz in Schöneberg.

- rev 5 (2026-10-28) : 当前版本 https://knowledge.ivjn.us/en/concepts/ubahn-berlin-u4/at/5.html

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