The Bremen tramway network () is a network of tramways forming part of the public transport system in Bremen, Germany. The network is currently operated by Bremer Straßenbahn AG (BSAG; Bremen Tramways Company Ltd.), and integrated in the Verkehrsverbund Bremen/Niedersachsen (VBN; Bremen/Lower Saxony Transport Association). , the network had 7 lines, extending over of route (up from of route in 2011). Lines The lines with the suffix "S" (e.g. line 1S) are express lines, which do not stop at every station. Line 3S was discontinued in 2014 because of lack of available trams. History Horse tramway On 28 March 1876 the Aktiengesellschaft Bremer Pferdebahn was founded. The enterprise opened a horse tramway line from Herdentor to Vahrster Brücke on 4 June 1876, extending the line to Horn in 1877. In 1883, the extension from Herdentor to the stock exchange in the city centre was opened. The rival company Große Bremer Pferdebahn, which used British capital, opened a line from Hastedt to Walle on 3 November 1879; today's line 2 partly follows the trajectory of that horse line. Both companies extended their network, and lines were opened to Freihafen (1888), Hohentor (1889) and Arsterdamm (1880/1884). Electric tramway In 1890, the line from the Stock Exchange to the Bürgerweide exhibition grounds was electrified as a trial for the duration of an exhibition. Once the exhibition had ended, the overhead line equipment was removed, but the system had worked so well that it was decided to electrify all tramways. Electrification was implemented by Union-Elektricitäts-Gesellschaft, the German subsidiary of the American Thomson-Houston Electric Company starting in 1892. The network was fully electrified by 1913, with the exception of the Freihafen line, which had been abandoned by then. Meanwhile, Große Bremer Pferdebahn merged with the Bremer Pferdebahn (which had renamed itself as Bremer Straßenbahn in 1890) in 1899. In 1908, line numbers were introduced. By 1939, the network consisted of the following lines: 1: Ringbahn 2: Gröpelingen - Markt - Sebaldsbrück 3: AG Weser - Markt - Hohwisch 4: Horn - Bahnhof - Markt - Arsterdamm 5: Flughafen - Markt - Bahnhof - Hemmstraße 6: Vulkanstraße - Brill - Bahnhof - Hemmstraße 7: Hartwigstraße - Bahnhof - Markt - Rablinghausen 8: Gröpelingen - Burg 10: Friedrich-Karl-Straße - Bahnhof - Waller Bahnhof 11: AG Weser - Norddeutsche Hütte 12: Sebaldsbrück - Osterholzer Friedhof 15: Hemmstraße - Bahnhof - Markt - Pappelstraße - Emder Straße (über Westbrücke)