U4, Rapid transit railway line in Hamburg, Germany
The U4 is a rapid transit line in Hamburg that spans 11.9 kilometers from HafenCity to Billstedt, serving 12 stations along the way. It shares track sections with the U2 line between Billstedt and Jungfernstieg and is identified by its turquoise color.
The line began service on November 29, 2012, as the first new branch extension of Hamburg's metro network. This expansion connected the growing HafenCity district directly to the city's rapid transit system for the first time.
The Überseequartier station displays design choices inspired by its waterfront surroundings and the port's character. This visual approach makes traveling through the modernized harbor district feel connected to Hamburg's maritime roots.
Most stations on this line are underground, so there is no need to navigate by surface landmarks. Departure times and connection information are clearly displayed at each station to help you plan your journey.
The line surfaces at only two points along its route: at Elbbrücken terminal and at Billstedt station. This rare feature makes it stand out among Hamburg's other metro lines, which mostly remain underground throughout their routes.
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