increased use of automobiles. On the following lines, service was abandoned: Line 8 1949 (Trolleybus at first, from 1961 diesel bus) Line 12 1952 Line 10 in St.-Jürgen-Straße Line 5 1964 Line 7 1965 Line 6 1965/67. The rails in Pappelstraße were used until 2001. Line 11 1970 Line 4 1972, the section Kirchbachstraße - Arsterdamm had been taken over in 1967 by the new Line 1. The line reopens in 1998. Lines 15 and 16 were renumbered to lines 5 and 6 in 1967. Network extensions However, some lines were also notably extended: Line 3 to Gröpelingen 1949 Line 16 to Grolland 1955, from 1976 (then line 6) to Huchting Line 6 to Gastfeldstraße 1955 (closed in 1967) Line 16 to Riensberg 1959 Line 15 to Kulenkampffallee 1960 Line 10 to Georg-Bitter-Straße 1963, to Sebaldsbrück and Gröpelingen 1975. The rails in Georg-Bitter-Straße continue to be used by extra trains. Line 1; new line Arsterdamm - Blockdiek, extended 1968 to Osterholz, from 1973 to Arsten, renamed to line 4 and extended to Arsten Süd on 7 December 1998. Line 4 reopened to Horn-Lehe 23 May 1998, extension to Borgfeld on 6 December 2002. Line 6 newly built between Flughafendamm and Flughafen, replaces old part of Line 5 on 23 May 1998. Line 6 extension between Riensberg and Universität, opened 10 October 1998. Line 3 new route via Überseestadt, opened 2 December 2006. Line 1 extension between Schweizer Eck (formerly Züricher Str.) and Nußhorn, opened 26 March 2012. Line 1 extension between Nußhorn and Mahndorf Station, opened 2 April 2013. Line 4 extension between Borgfeld and Falkenberg, opened 1 August 2014 Rolling stock Current GT8N In the late 1990s, the Hansa-built stock dating from the 1960s was scheduled for replacement. Since the BSAG had already invested in low-floor buses, low-floor tram vehicles were wanted as well. In 1990, the BSAG presented a prototype to the public. This three-section articulated car was the world's first 100% low-floor tram. From 1993 to 1996, 78 low-floor trams, classed as type GT8N, were ordered from AEG. Their main difference from the prototype is that they have four sections instead of three, hence offering more space and so more beneficial for wheelchair users. One vehicle has been taken out of service after an accident. The prototype was sold to the Norrköping tramways in Sweden in 1999. GT8N-1 The GT8N-1 is the newest tramway vehicle in BSAG's