U4 (Hamburg U-Bahn)

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U4
Overview
Stations	12
Service
Type	Rapid transit
System	Hamburg U-Bahn
Operator(s)	Hamburger Hochbahn
History
Opened	2012
Technical
Line length	11.9 km (7.4 mi)
Track gauge	4 ft 8+1⁄2 in (1,435 mm)
Route map v t e Legend     to Mümmelmannsberg Billstedt Legienstraße Horner Rennbahn Rauhes Haus Hammer Kirche Burgstraße Berliner Tor Hauptbahnhof Nord Jungfernstieg     to Niendorf Nord Überseequartier HafenCity Universität Elbbrücken ¹  shares tracks with

The U4 is a line of the Hamburg U-Bahn, which opened in 2012, serving 12 stations. It is the shortest line of the network, with a length of 11.9 kilometres (7.39 mi) and from Jungfernstieg to Billstedt it shares tracks with the U2.^[1][2][3] Its identifying colour, as seen on route maps, trains, and station signs is turquoise.^[4][5]