U4 (Berlin U-Bahn)

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Rathaus Schöneberg, one of the five stations on the U4
Overview
Locale	Berlin
Termini	Nollendorfplatz Innsbrucker Platz
Stations	5
Service
Type	Rapid transit
System	Berlin U-Bahn
Operator(s)	Berliner Verkehrsbetriebe
Depot(s)	Grunewald
Rolling stock	A3[1]
History
Opened	1 December 1910 (1910-12-01)
Separated from Line B	28 February 1966 (1966-02-28)
Technical
Line length	2.9 km (1.8 mi)[2]
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Loading gauge	Kleinprofil
Electrification	750 V DC third rail (top running)
Route map Legend -0.8 Reversing point -0.1 Nollendorfplatz    0.7 Viktoria-Luise-Platz 1.6 Bayerischer Platz 2.3 Rathaus Schöneberg 2.7 Innsbrucker Platz This diagram: view talk edit

The U4 is a line of the Berlin U-Bahn in Germany that is the shortest in Berlin's U-Bahn system, with a length of 2.86 kilometres (1.78 mi).^[2] Opened in 1910, the U4 serves five stations, all of which are step-free: it is also the only subway line in Berlin to have never been extended and the only one to have no night service on weekends.

In 1903, Schöneberg, an independent city that as south-west of the municipal limits of Berlin, planned to develop an underground railway line to improve public transportation. As the line promised less profit for private investors (all Berlin U-Bahn lines had until then been built with private capital), negotiations with the Berliner Hochbahngesellschaft (Berlin Elevated Railway Company, the operator of Berlin U-Bahn) were unsuccessful.

That made Schöneberg start to build the line itself on 8 December 1908. Two years later, the construction was finished, and on 1 December 1910, the line was put into operation. Although Schöneberg owned the track, upon the line's opening, the city handed operations over to the Hochbahngesellschaft.