U4 (Munich U-Bahn) · Relations URL: https://knowledge.ivjn.us/en/concepts/ubahn-muenchen-u4/relation.html At 9.2 km and 13 stations, the U4 is the shortest line of the Munich U-Bahn; it was opened in 1984 and runs from Westendstraße to Arabellapark. Page 1 / 0, 0 total