City railway line Bonn – Bad Godesberg

City railway line Bonn - Bad Godesberg
Course book section (DB) :	473.1
Route length:	8 kilometers
Gauge :	1435 mm ( standard gauge )
Power system :	750 V  =
Top speed:	80 km / h
Rheinuferbahn from Cologne Siegburg Railway from Siegburg 320.0 Bonn Central Station Hardtbergbahn tunnel connection Turning system Kaiserplatz 319.4 University / market 318.8 Juridicum 318.2 Federal Audit Office / Foreign Office 317.8 Museum Koenig 317.0 Heussallee / Museum Mile Turning system Heussallee (End of the inner city tunnel) 316.3 Ollenhauerstrasse 315.5 Olof-Palme-Allee to the south bridge 314.9 Max-Löbner-Strasse / Friesdorf 314.4 Hochkreuz / German Museum Bonn former tram route to Mehlem Bad Godesberg Tunnel (since 1994) 313.7 Wurzerstrasse 313.0 Plittersdorfer Strasse Rheinallee (terminus from 1976) 312.5 Bad Godesberg train station 312.1 Bad Godesberg town hall Tunnel connection towards Mehlem Turning system Church of the Redeemer Rüngsdorf Gutenbergallee Fir alley Mehlem Rhine ferry (and to Mehlem train station ) Flour place

The Bonn – Bad Godesberg line is part of the Bonn light rail network and connects the city center with the Bad Godesberg district . It emerged from the route of the Bonn – Godesberg – Mehlem tram (BGM), which from 1892 connected the then independent places with one another.

Route

Maiden voyage of the first electric train on the Bonn-Godesberg-Mehlem line on July 24, 1911

The route begins at the main station (U) junction and in a curve passes under the central bus station (ZOB) and Kaiserplatz . After crossing under the Hofgartenwiese parallel to the main building of the university , it swings in a 110 ° curve under the B 9 , which it follows for the next few kilometers. At the Ollenhauerstraße stop , the route comes into daylight via a ramp, after having reached its greatest depth immediately before crossing under the Trajektstraße. The following aboveground section runs in the median strip of the B 9. Between Max Löbner Street and High Cross is the depot Fries village where before the opening of the depot in Dransdorf the rail cars were stationed - Today the entire bus fleet of the SWB bus and train . A tunnel ramp connects directly to the Hochkreuz stop, but the route continues to follow the B 9 underground. After the Wurzerstraße, the route continues straight ahead and follows the slope of the site, while the B 9 turns into the road tunnel . Between Plittersdorfer Straße and Bad Godesberg Bahnhof , the tunnel crosses under the left-hand Rhine stretch and is in turn crossed by the road tunnel. At Bad Godesberg train station, the train crosses parts of the spa park in a curve before it ends at the town hall .

history

On May 22nd, 1892, a single-track , steam-powered, meter-gauge railway was opened between Godesberg and the terminus of the Bonn horse-drawn railway at what is now Bundeskanzlerplatz , on its own railway body largely on the former canal bed of the Godesberger Bach . Like the horse-drawn tram from Havestadt, Contag & Cie. built and operated. In the south, the route was extended to Mehlem in May of the following year . On October 23, 1893, an extension followed in the north through Kaiserstraße along the Reichsbahn line to Königstraße . A planned extension from Mehlem via Oberbachem , Berkum and Arzdorf to Meckenheim and a track connection to the Cologne-Bonn railway were never realized.

Tram Bonn – Godesberg – Mehlem

On October 15 and 17, 1904, the railway became the property of the city of Bonn and the still independent city of Godesberg in equal parts . Together with the sale of the horse-drawn tram, the trading of Havestadt, Contag & Cie. around 3,100,000 Reichsmarks .

Steam operation was stopped in three stages in 1911 and converted to a standard-gauge electric tram. The terminus in Bonn was moved to Kaiserplatz. The tram operation was handled under the name GM line , for intermediate trips there were the line signals G (Godesberg), R (Rüngsdorf) and F (Friesdorf). From 1925, the BGM in Bonn was extended to Hansaeck (today's Thomas-Mann-Straße ), creating a transfer option to the Cologne-Bonn Railways (KBE), and from 1937 their new Rheinufer station was also used.

During the Second World War , the railway ceased operations on March 2, 1945. This was resumed in sections between July 15 and November 12, 1945.

Because of the increasing individual traffic , the BGM received a separate track in 1956 in the middle of Bundesstraße 9 . The narrow streets in Bad Godesberg, however, only allowed a dedicated track structure to a limited extent. The railway between Rheinallee and Plittersdorfer Straße ran on its own track along the federal railway line , but on a single track. The crossing with Bürgerstraße was secured for years by a security guard, the so-called Schellenmännchen , against individual traffic.

With the incorporation of Bad Godesberg , 100% of BGM became the property of the City of Bonn. In the following year, the railway took over the name Line 3, which had not been used by the city tram since 1953 .

Changeover to light rail operation

Light rail concept 1972, the BGM is part of route A.

A tunnel between the main train station and Bundeskanzlerplatz had been under construction in Bonn since 1969 to replace the section through Kaiserstraße. In 1972 the concept of “Stadtverkehr Bundeshauptstadt Bonn” was decided, according to which the BGM should run the full length of the tunnel in the course of the city ​​railway line A from Bonn to Bad Godesberg. The section from the Rheinallee through Rüngsdorf to Mehlem was to be replaced by a new route closer to downtown Godesberg and further via Pennenfeld and Lannesdorf to Mehlem.

Because of the construction work for the tunnel, a diversion route was built in 1972: From the Reuter Bridge , the BGM drove straight along the railway line and met the B 9 again through Ollenhauerstrasse.

On July 13, 1973, two trains collided on the single-track section in front of the Mehlem Rheinfähre stop. As a result, the Rheinallee - Mehlem Ort section was shut down three days later. Articulated buses were used as replacement services for the first time in Bonn . After public protests, trams to Mehlem were resumed in March 1974.

Former final stop Rheinallee , instead of the ramp in the middle of the platform, there was originally the platform for line 3 to Mehlem

With the commissioning of the Bonn subway tunnel on March 20, 1975, traffic between Bonn and Bad Godesberg was taken over by the new U3 light rail line , which ran from the temporary Am Hauptbahnhof subway station to Rheinallee . The remaining section to Mehlem Ort was served by line 3 in island operation until December 1976, whereby the voltage of the overhead line had to be lowered every morning and evening to transfer the vehicles to the Friesdorf depot via the light rail line. After the tram was shut down, the route from Rheinallee via Rüngsdorf to Mehlem was served by bus line 13, since 1987 line 613, whose route and designation has survived almost unchanged since then.

Light rail operation

With the opening of the Hauptbahnhof underground station and the branch to the Rheinaue, the A metro line reached its preliminary final state in 1979. The previous U3 line was tied back to 3 and via the Rheinuferbahn to Tannenbusch, while line 16 coming from Cologne was extended to Godesberg. The S line from Siegburg also ran the section between the main train station and the Rheinaue junction. In the following 15 years there were no changes apart from the renaming of the 3 to 63 and the S to 66 in 1987, priority was given to work on other routes.

Ramming for the construction of the tram tunnel in Bad Godesberg (1988)

In the mid-1980s, it was decided to first build a tunnel for the section in Bad Godesberg; the lowering of the route on the B 9 was postponed for the time being due to its high construction standards and finally abandoned entirely. The construction of the tunnel in Bad Godesberg began in 1988. For the first time, a city railway tunnel was built in Bonn using predominantly mining techniques; the previous tunnels were built in open excavations. The new tunnel, inaugurated in 1994, runs roughly parallel to the old route as far as the Godesberg train station and then bends in a curve under the spa gardens to the new final stop, the Stadthalle .

After the completion of the tunnel, planning could begin to expand federal highway 9 in the area of ​​what was then the government district to become “Government Avenue”. The light rail on the above-ground section should also benefit from this through the renovation and closure of crossings. With the construction of the stop at the end of the A 562 , the gradual renovation of the above-ground section began in 2003. The tracks were moved a few meters to the west, and the stops, which were built in the 1970s as temporary measures for a few years, were gradually replaced by more complex structures by 2011.

Between the stops Olof-Palme-Allee and Max-Löbner-Straße , a new intersection of Heinemannstraße and Winkelsweg (since 2011 Marie-Schlei-Allee) with the B 9 was created. After its completion, the intersection of Max-Löbner-Straße and B 9 was reduced and rebuilt. This shifted traffic to the north; the tram was accelerated by the closure of the Max-Löbner-Straße intersection, as it can no longer be hindered by crossing car traffic. From 2008 to 2009, the Max-Löbner-Straße intersection was completely closed due to the construction of the Max-Löbner-Straße / Friesdorf stop . At the same time, the route between the new and old Max-Löbner-Straße stop was shifted four meters to the west to make room for the expansion of the east side of the B 9. The new western track had already been laid between the previous station at Max-Löbner-Straße and Hochkreuz, but was not connected before the new stop was completed.

The light rail line on the above-ground section (2010)

To the south of the Heussallee stop , behind a provisional ramp, there was an approximately 500-meter-long section of the trunk line tunnel that was unused until 2010 and was previously used as a turning facility. The tunnel crosses under Franz-Josef-Strauss-Allee there. This section of the tunnel was activated from the end of October 2008 to mid-May 2010 and received a new ramp. The Ollenhauerstraße stop was then rebuilt at the end of the ramp at what is now the Ollenhauerstraße intersection. The intersection was closed by the stop and replaced from May 2012 to June 2013 by a roundabout on the B 9 with Franz-Josef-Strauss-Allee and Marie-Kahle-Allee, the so-called “ Trajekt- Junction”. Relocating the tram to the tunnel accelerated the tram, as it can no longer be impaired by vehicle traffic crossing the Ollenhauerstraße junction. The overall construction work for the extension of the tunnel and the construction of the new station began in August 2007 and was completed in April 2011. This was also the end point of a modernization of the railway line that has been ongoing since 2005.

At the beginning of 2010, main signals were set up on parts of the above-ground route, since then only the 900 meters between the intersections Heinemannstrasse and Hochkreuz have been driven on sight .

Stations

Central station (U)

Central Station

The four-track underground station Hauptbahnhof is designed as the intersection of a north-south axis with an east-west axis and is frequented by around 50,000 passengers every day. The four tracks are on two central platforms, with the east-west lines on the inner and north-south lines on the outer tracks. Since the formerly planned west branch ( Hardtbergbahn ) was not built, the facility looks a bit oversized. A built as an input for the planned Hardtberg rail tunnel connecting piece now serves as a storage area for the last in Bonn remaining Achtachser . In addition to its actual function, the underground station fulfills another purpose: in the event of a crisis or disaster, the facility, built as a civil defense bunker, can accommodate up to 4,500 people. It has its own water and power supply as well as sanitary facilities (toilets and showers).

The stop, which opened in April 1979, has a futuristic design according to the standards of the time, with the colors silver-gray (ceilings and outer walls) and blue (floor and inner walls) dominating. The logos of metros from all over the world are on the outer walls , while children's images of various deities were attached to the inner walls in the 1990s .

Originally there were only elevated platforms on the outer tracks . Since a tram line also ended at the inner tracks, there were flat platforms there that were prepared for later elevation. After tram line 64 was closed in 1994, the inner platforms were raised over a weekend in 1997. A third of the platform remained at the original level so that trams could continue to end there in the event of a malfunction. This was possible because the stop is over 100 meters long, but the B-wagons used - double units - are only 60 meters.

Between the inauguration of the light rail tunnel in 1975 and the completion of the main train station in 1979, the light rail vehicles ended at a single-track temporary stop at Am Hauptbahnhof , which was located in the apron of today's main train station under the central bus station . After the start of the light rail service to Cologne (line 16), this system was the cause of many delays in the network. The double-track turning system belonging to the subway station , which is located south under the ZOB, represents the lowest point of the Bonn subway.

Bonn tunnel

The underground stops in Bonn were designed very similarly by the architects Alexander Freiherr von Branca and Busmann + Haberer and differ mainly in the color code used. Following the style of the 1970s, curves and strong colors predominate. At the end of the 1990s, many of the stops were brightened by the extensive use of white paint and corners that were difficult to see were closed with the aim of reducing the effect of the stations as fearful spaces .

The platform length of a uniform 100 meters comes from the original planning for KBE multiple units and appears to be significantly oversized on today's 60-meter-long trains.

University / market	The Universität / Markt stop is located under the Hofgartenwiese and runs parallel to the front of the main university building . Next to the stop is the university's underground car park, which was built at the same time. The identification color of the stop - previously known as “Unimaat” in driver announcements - is a light green. The eastern access to the bus stop (in the picture at the back) is unusual, which is not, as usual, a combination of stairs and escalators , but consists of long, curved ramps. The ramps meet below the floor gate in an intermediate level that can be reached from the surface via stairs and moving walks .	more pictures
Juridicum	The Juridicum stop is located below Adenauerallee, directly at the Beethoven Gymnasium and Juridicum , the lecture hall of the law and political science faculty of the University of Bonn . The ends of the stop are designed in the color code blue, analogous to the other stops. In the central area, the ceiling is raised to the intermediate level, the escalators run parallel to the track. In June 2016, one of the entrances to the stop was fitted with a steel and glass roof.	more pictures
Federal Audit Office / Foreign Office	The Bundesrechnungshof / Foreign Office stop is designed in a similar way to the other stations in the trunk line tunnel. Their color code is orange-yellow. A special feature of the stop are the stairs that lead away from the track at right angles and have an additional landing between the platform and the mezzanine level. In June 2016, the entrances to the bus stop were fitted with steel and glass roofs. Originally the stop was called the Foreign Office . It was given its current name in 1999 after the Federal Audit Office took over some buildings from the Foreign Office.	more pictures
Museum Koenig	The Museum Koenig stop is also under Adenauerallee. It is named after the Koenig natural history museum , which also designs some showcases on the platforms. In terms of design, the stop follows the other tunnel stops, but the color code brown stands out clearly from the "bright" colors of the other stops.	more pictures
Heussallee / Museum Mile	The Heussallee / Museumsmeile stop is between the Heussallee intersection and Bundeskanzlerplatz . Until the 1990s it was called Heussallee / Bundeshaus , as it was in the immediate vicinity of the Bundestag and the Federal Chancellery . The stop is designed in a similar way to the other tunnel stops on the main route, its color code is yellow. However, there were extensive modifications: The stop was the first on the route that was subsequently made barrier-free by installing elevators. The southern entrance was redesigned when the Bundeskunsthalle and the art museum were built. The northern entrance and the associated intermediate level were completely redesigned and widened during the construction of the House of History from 1991 to 1994 according to plans by the architecture firm Busmann + Haberer . There are now numerous showcases on the mezzanine level. There is also direct access to the exhibition area in the basement of the House of History. In the summer of 2016, the entrances to the bus stop were equipped with steel and glass roofs.	more pictures

Bundesstrasse 9

The route laid out in 1956 in the median of the B 9 between Bonn and Bad Godesberg was equipped with elevated platforms to commence operations in 1975. Since at that time an extension of the tunnel to Bad Godesberg was planned soon, all stops were built according to the simple standard with temporary platforms made of precast concrete parts with asphalt surfaces and sheet metal walls as temporary arrangements with a service life of a few years. The plans for the tunnel construction were abandoned during the 1980s. In connection with the tunnel construction in Bad Godesberg, a redesign of the B 9 as a "federal avenue" was planned; In addition to moving the railway a few meters to the west, these plans also envisaged a comprehensive design concept which, in addition to the tram stops, also included a special design of overhead line masts, signals and street lamps. As a first step, the Hochkreuz stop received new platforms for the opening of the tram tunnel in Bad Godesberg in 1994, but the actual redesign only began in 1999 with the opening of the Godesberg road tunnel . Starting with the Wurzerstraße – Hochkreuz section on Godesberger Allee , the road and stops were gradually rebuilt. Since spring 2011, all stops have been rebuilt.

The provisional stops had meanwhile been renovated in 1997: Since they had exceeded their expected service life, sheet metal parts and panes were replaced and the frames were given a light-colored paint.

Ollenhauerstrasse	The Ollenhauerstraße stop (2005 to 2012: Deutsche Telekom / Ollenhauerstraße, originally Johanniter Hospital ) is located in the median of the B 9 between Ollenhauerstraße and Zitelmannstraße. It is designed in a similar way to the Max-Löbner-Straße / Friesdorf stop to the south. Until the end of 2008, the stop was 140 meters further north. In the mid-1970s, it was built as a temporary solution from precast concrete, was given an asphalt surface and a tin roof as weather protection. At the end of the 90s, the weathered sheet metal parts were replaced and many areas were painted light in order to make the station at least a little friendlier. Due to a track change and two left-turn lanes, the space was very limited, so that the two side platforms were offset from one another and had a common entrance in the middle. The original plans for an extension of the trunk line tunnel to Bad Godesberg, which would have made the above-ground stop superfluous, were discarded in the 1980s. The new construction of the stop from August 2010 to March 2011 behind the intersection Marie-Kahle-Allee / B 9 / Franz-Josef-Strauss-Allee took place in connection with the extension of the underground tunnel to the south as a prerequisite for the new construction of the so-called " Trajectory node ". Between 2008 and 2011 the trams stopped at a provisional stop. With the station opened in 2011, the reconstruction of the above-ground section of the main line was completed.	more pictures
Olof-Palme-Allee	The Olof-Palme-Allee stop (2008 to 2012: Deutsche Telekom / Olof-Palme-Allee ) has been located on the former United Nations Square on the bridge of the B 9 over the A 562 since 2003 . Until 2003, the stop was about 100 meters further northwest in front of the state authorities . The old stop consisted of two side platforms made of precast concrete parts with sheet metal roofs, which had been built as a temporary measure in the mid-1970s. The side platforms turned out to be unfavorable in particular because the stop, as the end point of the main route, has a considerable number of transfer passengers between the Rheinauen route and the Bad Godesberg route. The name of the stop was State Authority House / Police Headquarters until Deutsche Telekom acquired the naming rights in 1999. The additional designation Platz der United Nations was added in December 2005 after the group had also bought the name of the Ollenhauerstraße stop . The elaborate design of the bus stop, which opened in December 2004 and cost 3.5 million euros, with its surrounding light sculptures has already received several awards. With the abandonment of the name “Platz der United Nations”, a new name was also necessary for the stop.	more pictures
Max-Löbner-Strasse / Friesdorf	The Max-Löbner-Straße / Friesdorf stop is on Godesberger Allee (B9) at the junction with Max-Löbner-Straße. This tram stop is designed in a similar way to the Hochkreuz stop to the south and has 60-meter-long elevated platforms that are barrier-free. This stop was inaugurated in May 2009. Previously, a stop with the same name was located 125 meters further south. Similar to the Ollenhauerstraße stop, it was a provisional stop on concrete parts with asphalt pavement and sheet metal weather protection, which had long exceeded its expected service life and was economically renovated at the end of the nineties. Even before the new station was completed, it was demolished in spring 2008 and the B9 was further expanded. The cost of the new stop was 2.5 million.
Hochkreuz / German Museum Bonn	The Hochkreuz / Deutsches Museum Bonn stop is at the intersection of Godesberger Allee (B 9) and Hochkreuzallee / Kennedyallee . There is a copy of the eponymous high cross at the stop . The reference to the Bonn branch of the Deutsches Museum was added to the name of the stop at the end of the 1990s. For many years, the stop was a temporary solution of the same type as the other above-ground stops on the main line. In the course of the construction of the adjoining tunnel, the above-ground Hochkreuz stop was also rebuilt. The new stop has been in operation since 1994, but the roof structure was not added until 1999.

Godesberg tunnel

The four stops of the Godesberg Tunnel follow a common design concept: In addition to the metallic stripes at eye level with the stop name and the colored surfaces, which were adopted from the Bonn tunnel stops, all stops have wall niches tiled in dark gray, some of which are provided with benches made of light wood. In the intermediate levels there are large copper engravings with historical scenes from Bad Godesberg. There is a lot of natural stone in the entrance areas.

With the exception of the Bad Godesberg Bahnhof stop, all stops have 60 meter long platforms; a further 30 meters were built in the shell and are located behind partition walls.

Wurzerstrasse	The Wurzerstraße stop is the first stop in the Bad Godesberg urban railway tunnel opened in 1994. It is located below the intersection of Wurzerstraße / Elsässer Straße and Godesberger Allee (B 9). It is the only stop in Godesberg with access in the middle of the platform. The identification color of the stop is red, which is, however, supplemented by many white areas.	more pictures
Plittersdorfer Strasse	The Plittersdorfer Straße stop is below the Plittersdorfer Straße level crossing. The intermediate level of the stop also serves as a pedestrian underpass under the left Rhine route . The stop's color code is blue; access is at the end of the platform.	more pictures
Bad Godesberg train station	The Bad Godesberg Bahnhof stop is below Moltkestrasse between Alter Bahnhofstrasse and Löbestrasse. Its northern entrance also serves as a pedestrian underpass from Alte Bahnhofstrasse to Rheinallee under the previously heavily used Moltkestrasse. The southern entrance leads to the forecourt of the Bonn-Bad Godesberg train station . As the only stop in the Godesberg Tunnel, the station has access to both ends of the platform, due to the distance between the DB train station and the main axis of the Godesberg pedestrian zone. Their identification colors are yellow and orange. In the northern entrance there is a shop, the entrance to the platform level is designed as a hall, with the front side representing the Godesburg . In accordance with the importance of traffic, the platform is significantly wider than at the other Bad Godesberg stops.	more pictures
City Hall	The Stadthalle stop is the provisional end point of the Bad Godesberg route. It is located below Friedrich-Ebert-Straße between the town hall , to which there is a direct passage on the intermediate level, and the Rigal'schen Wiese. In addition to a park-and-ride area, there are several bus stops on the surface, where all Bad Godesberg bus routes stop. In particular, connections to Heiderhof , Pennenfeld , Lannesdorf and Mehlem are to be created in this way. The stop has been designed in the color code green similar to the other Bad Godesberg tunnel stops. The noticeable difference is that there are additional supports between the tracks on which large-scale paintings have been mounted.	more pictures

Expansion plans

At the Stadthalle stop , preliminary work is being carried out for a tunnel ramp on the planned route to Mehlem .

Vehicle use

In terms of vehicles, the BGM was very progressive; Since the beginning of the 1930s, the three-car trains built by Westwaggon had a four-axle low-floor sidecar with them, which was strongly lowered in the middle and thus enabled easy access ("bathtub"). These spacious and smooth-running wagons were very popular with the population. Later, very comfortable modern three-car two-way trains with upholstered seats were used, but they could not stop the decline of tram operations.

Since the switch to light rail operation, the line has been operated with vehicles of the Bonn standard type Stadtbahnwagen B , which have been supplemented by the more modern type Flexity Swift since 2003 .

literature

• Gustav Hofmann: The steam tram Bonn – Godesberg – Mehlem . In: Association for home care and home history Bad Godesberg (Hrsg.): Godesberger Heimatblätter . Issue 36, 1998, ISSN  0436-1024 , pp. 13-33 . [not yet evaluated for this article]

Web links

Commons : Bonn – Bad Godesberg tram line  - collection of images, videos and audio files

Individual evidence

1. ↑ ^{a b} Name of the stop unclear because it is not indicated on the historical city ​​map (Falk, 1963).
2. ^ Gustav Hofmann: The steam tram Bonn – Godesberg – Mehlem . In: Association for home care and home history Bad Godesberg (Hrsg.): Godesberger Heimatblätter . Issue 36, 1998, ISSN  0436-1024 , pp. 13-33 .
3. ↑ scanned newspaper article. In: General-Anzeiger . August 16, 1973. Retrieved January 14, 2018 . 
4. ^ Entry in the Bonn street cadastre
5. ↑ Bernd Leyendecker: Until 2009, another 24 million euros will be invested. General-Anzeiger , March 18, 2006, accessed January 14, 2018 . 
6. ^ Bettina Köhl: Night shifts on Bertha-von-Suttner-Platz. General-Anzeiger , June 17, 2006, accessed January 14, 2018 . 
7. ^ ^{A b} Frank Vallender: The breakthrough is imminent in the federal district. General-Anzeiger , March 11, 2008, accessed January 14, 2018 . 
8. ↑ B 9 becomes the bottleneck for a short time on Wednesday evening. (No longer available online.) General-Anzeiger , November 25, 2009, archived from the original on November 27, 2009 ; accessed on January 14, 2018 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.   
9. ↑ Explanation of the construction phases on gleisplanweb.bplaced.net
10. ↑ Trajekt junction: Start of construction for the roundabout on the B 9. (No longer available online.) City of Bonn, April 25, 2012, archived from the original on October 5, 2012 ; accessed on January 14, 2018 .  
11. ↑ Cem Akalin: The roundabout on the B9 is taking shape. General-Anzeiger, January 11, 2013, accessed January 14, 2018 . 
12. ↑ The new Ollenhauerstraße tram stop is in operation. City of Bonn, March 29, 2011, accessed on January 14, 2018 . 
13. ↑ Rolf Kleinfeld: The last stop on the B 9 is ready. General-Anzeiger, March 11, 2011, accessed January 14, 2018 . 
14. ↑ The large protection room in the Bonn Hauptbahnhof underground station on geschichtsspuren.de (formerly lostplaces.de)
15. ↑ absence-of-fear.de ( Memento of the original from September 4, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. 
16. ^ Friedrich Busmann : Expansion of the federal capital. 10 years capital city agreement 1975–1985 . Ed .: Karl-Heinz van Kaldenkerken , City Director Bonn. Bonn 1986, p. 81 .
17. ↑ ^{a b c} Glass roofs for underground stations. General-Anzeiger , May 13, 2014, accessed January 14, 2018 . 
18. ↑ ^{a b c} Train stops on the B9: entrances are covered. City of Bonn, March 31, 2016, archived from the original on April 24, 2016 ; accessed on January 14, 2018 . 
19. ↑ ^{a b} stairways at the stop "Bundesrechnungshof / Foreign Office" with new steel and glass roofs. SWB Bus und Bahn, June 24, 2016, archived from the original on June 25, 2016 ; accessed on January 14, 2018 . 
20. ^ Friedrich Busmann : From the parliament and government district to the federal quarter. A Bonn development measure 1974-2004 . Ed .: The Lord Mayor of Bonn. Bonn June 2004, p. 135, 138 .
21. ↑ SWB is carrying out extensive track construction work along the B9. (No longer available online.) Archived from the original on July 8, 2009 ; accessed on January 14, 2018 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.   
22. ↑ Inauguration of the new Max-Löbner-Straße tram stop. City of Bonn, May 13, 2009, accessed on January 14, 2018 .