U4 (Vienna U-Bahn)

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Line U4 U-Bahn-Linie U4
Line U4 train at Kettenbrückengasse
Overview
Status	Operational
Termini	Hütteldorf Heiligenstadt
Connecting lines
Stations	20
Service
Type	Rapid transit
System	Vienna U-Bahn
Operator(s)	Wiener Linien
Depot(s)	Wasserleitungswiese, Hütteldorf
History
Opened	8 May 1976 (1976-05-08)
Technical
Line length	16.5 km (10.3 mi)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification	750 V DC third rail

Line U4 is a line on the Vienna U-Bahn metro system. Opened in 1976, it currently has 20 stations and a total length of 16.5 km (10.3 mi), from Hütteldorf to Heiligenstadt.^[1] It is connected to U1 at Karlsplatz and Schwedenplatz, U2 at Schottenring, U3 at Landstraße, U6 at Längenfeldgasse and Spittelau.