Ringlinie
In mid-2000 all operating W-class trams were removed from service following a series of incidents involving brake problems. Some returned to service in May 2001 on the City Circle route, with 25 operating in September 2003. The return of another 30 W-classes was announced in September 2003, but on more limited routes than before their withdrawal from service. All 53 had been returned to service by late 2003. The reintroduction followed the installation of new braking systems, speedometers, and the imposition of a 40 km/h speed limit. The trolley poles were subsequently replaced with pantographs.