During summer 2003 a survey commissioned by Peter Strieder, Berlin's Senator for City Development and Traffic, and Deutsche Bahn director Hartmut Mehdorn was conducted among Berlin residents with the intention of selecting a name for the station. Of the three possibilities listed on the survey, the majority of participants opted for Lehrter Bahnhof; nevertheless, the station remained "Berlin Hauptbahnhof – Lehrter Bahnhof", an option that was not listed. It was decided early in 2005 that the station would be renamed "Berlin Hauptbahnhof" on the date of its opening, 28 May 2006, to avoid confusing rail passengers. On the same day, Berlin Papestraße station, which was rebuilt as the city's second-largest station, opened officially under its new name, Berlin Südkreuz (South Cross), similar to the existing Ostkreuz and Westkreuz stations. It is also on the new north-south route. Although it was intended to open a further station as Berlin-Nordkreuz (North Cross), the name Berlin-Gesundbrunnen was retained for what became Berlin's fourth biggest railway station for commuter and long distance trains, located in a more northern part of Berlin, where the circle and north-south-line of the S-Bahn cross each other. In 2005 the bridging segments, which cross over the roof of the station, were lowered. This was the first time, this unique method to build later office rooms was applied. The architect Meinhard von Gerkan filed a complaint against Deutsche Bahn in October 2005 after Deutsche Bahn altered the station construction timeline without proper authority. The complaint was upheld in late 2006. There may therefore be further construction on the station in the future. In addition, Deutsche Bahn decided to implement a slightly different version of the "Pilzkonzept" by running intercity trains through the new Tiergarten tunnels rather than via the Stadtbahn. This move was unpopular for its effect on Berlin's two previous main stations; Bahnhof Berlin Zoologischer Garten (Zoo Station) was downgraded to a regional railway station, and the number of main line services to Berlin Ostbahnhof (East Station) was drastically reduced. On 26 May 2006, the station was ceremonially opened by Chancellor Angela Merkel, who arrived together with transport minister Wolfgang Tiefensee in a specially chartered InterCityExpress from Leipzig.