alternated between Königsbrück and the airport (the last option was implemented). S-Bahn lines from Bischofswerda and Kamenz would have run on the main line via Dresden-Neustadt to Heidenau and end in Dohna on the Müglitz Valley Railway. Heidenau, Pirna and Bad Schandau were not considered as possible end points. The traffic concept had four S-Bahn lines on the main route, with its own S-Bahn tracks, which between them would have run every 7.5 minutes. However, these plans had already been rejected by the end of the 1990s. The S-Bahn line to Tharandt would have been extended to Freiberg, which has been partly realised since the timetable change of 9 December 2007 as the S 30 (now S 3). Other considerations In addition to the already newly built S-Bahn stations of Dresden Freiberger Straße, Dresden Flughafen, Meißen Altstadt and Dresden Bischofsplatz, the transport development concept 2025 of the city of Dresden includes another S-Bahn station in Dresden at the corner of Königsbrücker Straße and Stauffenbergallee (S 2). In addition, the existing Strehlen station is to be developed into a central interchange between the S-Bahn, trams and buses. It is also proposed to establish another S-Bahn line between the Hauptbahnhof and Coswig. This is intended to strengthen existing regional traffic. The goal is services every 30 minutes via Friedrichstadt and Cotta. In Cotta a new central station is to be created with connections to buses and trams. Concrete plans for these objectives are not known. Passenger numbers 37,300 passengers per day use the Dresden S-Bahn lines from Mondays to Fridays (as of 2012). These are about 70% of the railway passengers in the VVO area. In November 2013, Deutsche Bahn reported the number of daily passengers at around 36,000. The individual lines recorded the following average daily passenger numbers in 2015: S1 Dresden – Schöna weekdays: 14,420 passengers (2009: 12,060 passengers) weekends/holidays: 13,760 passengers (2009: 12,085 passengers ) S2 Dresden – Pirna weekdays: 3,690 passengers (2009: 4,190 passengers) S3/RB30 Dresden – Tharandt weekdays: 5,450 passengers (2009: 4,480 passengers) weekends/holidays: 3,360 passengers (2009: 2,775 passengers) Invitation to tender for transport services On 11 March 2008, the Zweckverband Verkehrsverbund Oberelbe (ZVOE) published a tender for passenger operations on all lines of the Dresden S-Bahn. These were combined in lot 1. Lot 2 included Regionalbahn lines RB33 (Dresden–Königsbrück) and RB34 (Dresden–Kamenz). Lot 3 included Regionalbahn lines RB 71 (Pirna–Neustadt–Bad Schandau) and RB72 (Heidenau–Altenberg) as well