Ekeberg Line
Encyclopedia
The Ekeberg Line is a 6.6 kilometres (4.1 mi) long light rail
Light rail
Light rail or light rail transit is a form of urban rail public transportation that generally has a lower capacity and lower speed than heavy rail and metro systems, but higher capacity and higher speed than traditional street-running tram systems...

 line of the Oslo Tramway which runs from Gamlebyen to Ljabru
Ljabru
Ljabru is a hill and neighborhood in the borough of Nordstrand in Oslo, Norway.It is mainly a residential area with detached housing as well as larger blocks. It is served by the Ekeberg Line terminal station Ljabru...

 in Oslo
Oslo
Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...

, Norway
Norway
Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. Operated by lines 18 and 19, it serves the area of Nordstarand
Nordstrand, Norway
Nordstrand is a borough of the city of Oslo, Norway.The borough is located in the southern part of the city and is the second most populated district of Oslo with over 40,000 inhabitants...

 and the neighborhoods of Ekeberg
Ekeberg
Ekeberg is a neighborhood in the city of Oslo, Norway. The Norway Cup soccer tournament takes place at Ekebergsletta every summer. "Sletta" means plateau. The painting "the Scream" by Edvard Munch is painted from Utsikten a part of Ekeberg.In the area are a number of old Iron Age grave mounds and...

, Jomfrubråten
Jomfrubråten
Jomfrubråten is a residential area of Nordstrand in Oslo, Norway. It is located approximately away from the city centre. The area was disintegrated from Ekeberg in 1920, and made a residential area when the Ekeberg Line opened in 1917...

, Bekkelaget
Bekkelaget
Bekkelaget is an area in the borough Nordstrand in Oslo, Norway.Until 2004 it was, together with adjacent Ekeberg, a part of the borough Ekeberg-Bekkelaget.Bekkelaget is known nationwide for the sports club Bækkelagets SK....

 and Ljan. The line is operated by Oslo Sporvognsdrift
Oslo Sporvognsdrift
Oslotrikken AS, formerly Oslo Sporvognsdrift AS, is the company that operates the Oslo Tramway in Oslo, Norway. Oslotrikken is owned by Kollektivtransportproduksjon, which is again owned by the city council and has an operating contract with Ruter. The company operates 72 trams , has 374 employees...

 using SL79
SL79
SL79 is a class of 40 articulated trams operated by the Oslo Tramway of Norway. The trams were a variation of the Duewag trams that had been developed by the German manufacturer since the 1950s. The six-axle vehicles are unidirectional with four doors on the right side. The trams can seat 77...

 and SL95
SL95
SL95 is a series of 32 low-floor, articulated trams operated on the Oslo Tramway. The series is built by Ansaldo/Firema of Italy and delivered between 1999 and 2004. Capacity for the eight-axle, three-section vehicles is 212 passengers, of which 88 can be seated. The name derives from being ordered...

 trams on contract with Ruter
Ruter
Ruter As is the public transport authority for Oslo and Akershus, Norway. The company, organized as a limited company is responsible for managing, but not operating, public transport in the two counties, including bus, the Oslo Metro, the Oslo Tramway and ferries...

. The line itself is owned by Kollektivtransportproduksjon. At Oslo Hospital
Oslo Hospital (station)
Oslo Hospital is a light rail station on the Ekeberg Line of the Oslo Tramway. It is located near Oslo Hospital in Ekeberg, in the borough of Gamlebyen, in Oslo, Norway....

, the line connects to the Gamleby Line
Gamleby Line
The Gamlebyen Line is a section of the Oslo Tramway which runs east from Jernbanetorget along Schweigaards gate , past the Oslo Bus Terminal then turns south along Oslo gate, and past Gamlebyen before becoming the Ekeberg Line...

, which runs to the city center.

Proposals for a line in the area were first launched 1897, but not until 1914 were the necessary permits granted. The line was built and operated by Ekebergbanen
Ekebergbanen (company)
AS Ekebergbanen was a private company that built and operated the Ekeberg Line in Oslo, Norway. It was founded 27 March 1914, and the line opened 11 June 1917 from Stortorvet to Sæter. The company also built a line to Simensbråten that was closed 29 October 1967...

. The line opened in 1917, and connected to the Gamleby Line to reach Stortorvet
Stortorvet (station)
Stortorvet is a station on the Oslo Tramway in Oslo, Norway. The station is located on the square Stortorvet in the city centre.It is served by the lines 11, 17 and 18. In 2009, it was decided to improve the square, the station and the tram tracks in the street.-References:...

 in the city center. The line differed from the street trams in that it ran in its own right of way and used 1,200 volt supply, unlike the 600 volts used in the streets. In the early 1930s, the line was rebuilt to double track and a branch, the Simensbråten Line
Simensbråten Line
The Simensbråten Line was a light rail line of Oslo Tramway between Jomfrubråten and Simensbråten in Oslo, Norway. Opening on 30 September 1931, it branched off the Ekeberg Line at Jomfrubråten and had three stops along the route—Ekebergparken, Smedstua and Simensbråten. Operated by Ekebergbanen,...

, was built. The Ekeberg Line was extended to its current terminus in 1941. In 1948, the company was taken over by the municipal Oslo Sporveier
Oslo Sporveier
Kollektivtransportproduksjon AS is a municipal owned public transport operator of Oslo, Norway, the name meaning simply "public transportation producer". It operates the trackage and maintains the stock of the Oslo Metro and Oslo Tramway, as well as owning eight operating subsidiaries...

 and operations were integrated in 1965. The line was nearly closed in 1967 and 1973, but during the 1970s, the line received new rolling stock and a renovation. Future plans include an extension to Hauketo Station
Hauketo Station
Hauketo Station is a railway station at Nordstrand in Oslo, Norway. Located on the Østfold Line, it is served by the Oslo Commuter Rail line 500, operated by Norges Statsbaner with two hourly services. The station was opened in 1925.-External links:*...

 on the Østfold Line and a new route via Bjørvika
Bjørvika
Bjørvika is a neighborhood in the Sentrum borough of Oslo, Norway. The area is an inlet in the inner Oslofjord, situated between Gamlebyen and Akersness. It serves as an outlet for the river Akerselva. Since the 2000s, it has been undergoing urban redevelopment, being transformed from a container...

 to the city center.

Route

The Ekeberg Line is a 6.6 kilometres (4.1 mi) long continuation of the Gamleby Line, from which it connects at Oslo Hospital
Oslo Hospital (station)
Oslo Hospital is a light rail station on the Ekeberg Line of the Oslo Tramway. It is located near Oslo Hospital in Ekeberg, in the borough of Gamlebyen, in Oslo, Norway....

, located near sea level and 2.4 kilometres (1.5 mi) from Stortorvet
Stortorvet (station)
Stortorvet is a station on the Oslo Tramway in Oslo, Norway. The station is located on the square Stortorvet in the city centre.It is served by the lines 11, 17 and 18. In 2009, it was decided to improve the square, the station and the tram tracks in the street.-References:...

, the traditional terminus in the city center. The entire line is built as a light rail with its own right-of-way. The line is electrified at 750 volts with overhead wires. It runs up Ekeberg on the east side of Kongsveien, passing Sjømannsskolen
Sjømannsskolen (station)
Sjømannsskolen is a light rail station on the Ekeberg Line of the Oslo Tramway. It is located near Sjømannsskolen in Ekeberg, in the borough of Nordstrand, in Oslo, Norway....

 at 59.5 metres (195.2 ft) above mean sea level
Above mean sea level
The term above mean sea level refers to the elevation or altitude of any object, relative to the average sea level datum. AMSL is used extensively in radio by engineers to determine the coverage area a station will be able to reach...

 (AMSL) and 0.8 kilometre (0.497098189319845 mi) from Oslo Hospital. The next station is Jomfrubråten
Jomfrubråten (station)
Jomfrubråten is a light rail station on the Ekeberg Line of the Oslo Tramway. It is located near Jomfrubråten in Ekeberg, in the borough of Nordstrand, in Oslo, Norway.The station opened on 11 June 1917 as part of the Ekeberg Line to Sæter...

, which is located 2 kilometres (1.2 mi) from Oslo Hospital and at 115 metres (377.3 ft) AMSL. This is where the Simensbråten Line previously branched off. Past Jomfrubråten, the Simenbråten Line, while it existed, ran under the Ekeberg Line.

The next station is Sportsplassen
Sportsplassen (station)
Sportsplassen is a light rail station on the Ekeberg Line of the Oslo Tramway. It is located near Sportsplassen in Ekeberg, in the borough of Nordstrand, in Oslo, Norway....

, located 400 metres (1,312.3 ft) further south, at 108.9 metres (357.3 ft) AMSL, followed by Holtet
Holtet (station)
Holtet is a light rail station on the Ekeberg line of the Oslo Tramway. It is located at Holtet in Ekeberg, in the borough of Nordstrand, in Oslo, Norway....

, which is 3.2 kilometres (2 mi) from Oslo Hospital and at 115.5 metres (378.9 ft) AMSL. Holtet is the location of the depot and a balloon loop
Balloon loop
A balloon loop or turning loop allows a rail vehicle or train to reverse direction without having to shunt or even stop. Balloon loops can be useful for passenger trains and unit freight trains, such as coal trains....

. At Holtet, the line crosses Kongsveien and continues along the west side of Ekebergveien. The next station is Sørli
Sørli (station)
Sørli is a light rail station on the Oslo Tramway.Located at Sørli in Nordstrand, the station is situated between Holtet and Kastellet. It was opened in 11 June 1917. The station is served by lines 18 and 19.-References:...

, which is located 4 kilometres (2.5 mi) from Oslo Hospital and at 111.7 metres (366.5 ft) AMSL, followed by Kastellet
Kastellet (station)
Kastellet is a light rail station on the Oslo Tramway.Located at Kastellet in Nordstrand, the station is situated between Sørli and Bråten. It was opened in 11 June 1917.-References:...

 located 4.4 kilometres (2.7 mi) from Oslo Hospital and at 112 metres (367.5 ft) AMSL. The line continues past Bråten
Bråten (station)
Bråten is a light rail station on the Oslo Tramway.It is located at Bråten in Nordstrand. It was opened in 11 June 1917. There is a balloon loop just after the station.-References:...

, located 4.9 kilometres (3 mi) from Oslo Hospital and at 117.6 metres (385.8 ft) AMSL and past Sæter
Sæter (station)
Sæter is a light rail station on the Oslo Tramway.Located at Nordstrand, it was the terminus of the Ekeberg Line when it was opened in 1917 by AS Ekebergbanen in cooperation with Kristiania Sporveisselskab. In 1941 the Ekeberg Line was extended to Ljabru, the current terminus. Until 1967, the...

, located 5.6 kilometres (3.5 mi) from Oslo Hospital and at 116 metres (380.6 ft) AMSL. Between Sæter and Ljabru
Ljabru (station)
Ljabru is a light rail station on the Oslo Tramway.Located at Ljabru in Nordstrand, it is the current terminus of the Ekeberg Line. It was opened on 17 September 1941 as an extension of that line from Sæter. Until 1967, the stretch between Sæter and Ljabru was the only single track rail in Oslo. A...

 is a bridge over Nordstrandsveien which is single tracked. Ljabru is the terminus and is located 7.6 kilometres (4.7 mi) from Oslo Hospital and at 100 metres (328.1 ft) AMSL.

Service

The Ekeberg Line is served by lines 18 and 19 of the Oslo Tramway. Line 19 always runs the full length of the line, while Line 18 does not operate from Ljabru to Holtet during the morning and afternoon. Line 18 connects via the city center to the Ullevål Hageby Line
Ullevål Hageby Line
The Ullevål Hageby Line is a light rail section of the Oslo Tramway. It runs from Stortorvet in the city center of Oslo, Norway to Rikshospitalet. It passes through the areas of St. Hanshaugen, Ullevål Hageby and Blindern before reaching Gaustad...

 while Line 19 runs onwards along the Briskeby Line
Briskeby Line
The Briskeby Line is a section of the Oslo Tramway which runs between Jernbanetorget, through the neighborhoods of Briskeby and Uranienborg, before arriving at Majorstuen...

. Travel time from Ljabru to Holtet is 7 minutes, to Oslo Hospital is 14 minutes and to Jernbanetoget is 20 minutes. Both of the lines run every 10 minutes during the day, every 20 minutes during the evenings and part of the weekends and every 30 minutes during early mornings on weekends. This gives a peak service of every 5 minutes along the Ekeberg Line. The service is provided using high-floor SL79 and low-floor SL95 trams. Because of the lack of a balloon loop at Rikshospitalet
Rikshospitalet (station)
Rikshospitalet is a light rail tram station at the end of the Ullevål Hageby Line of the Oslo Tramway. It is located at Rikshospitalet, the Norwegian National Hospital, at Gaustad in Oslo, Norway....

, Line 18 must be operated with SL95 units, while SL79 units are used on Line 19 because the Brikeby Line does not have a high enough permitted axle load to for the SL95 units.

Construction

The Nordstrand area of Aker
Aker, Norway
Aker is a former municipality in Akershus, which lends its name to a municipality and a county in Norway. The name originally belonged to a farm which was located near the current Old Aker Church...

 was first served by steam ships from 1860s, which connected the lower areas to Oslo. In 1879, the Østfold Line (then the Smaalen Line) opened in 1879, giving these areas a regular service unaffected by the weather. In 1897, a public meeting was held regarding transport in the upper parts of Nordstand, the Ekeberg area. On 15 March 1899, Solicitor Einar Borgen, Engineer A. J. Jackwitz and Robert Iversen sent an application to build an electric railway from Oslo to Ljan. They were later supplemented with Contractor S. Sørensen. The application was considered in Aker Municipal Council on 14 March 1901, and placed on hold. It was again considered a year later, this time it was placed on hold because the politicians wanted to see how the new Railway Act would affect the plans.

A new application for the same route was made on 16 April 1907, this time from Solicitor H. M. Helliesen, Wholesaler A. Thune-Larsen, and Works Manager T. Poppe of Kristiania Sporveisselskab
Kristiania Sporveisselskab
AS Kristiania Sporveisselskab or KSS, nicknamed the Green Tram , was the first tram operator in Oslo, Norway. Founded in 1874, it started operation of horsecar services the following year and electric tram services in 1899...

 (KSS), the company which operated one the city tramways. This time the plans were slightly changed, with the route proposed built with a tramway rather than as a railway. In particular, the line was to connect to the Gamleby Line
Gamleby Line
The Gamlebyen Line is a section of the Oslo Tramway which runs east from Jernbanetorget along Schweigaards gate , past the Oslo Bus Terminal then turns south along Oslo gate, and past Gamlebyen before becoming the Ekeberg Line...

 (then called the Oslo Line) of KSS's network and run up Ekeberg to an intersection between Ekeberveien and Kirkeveien. The plans called for a regular street tram with regular city tram vehicles. At the time, the city limits of Oslo went at Sjømannskolen. The application for the part within Oslo was sent to the city, while for the section outside the city, the application was sent to the Ministry of Labour. Within Oslo, a new line would only have to be built from Oslo Hospital to Sjømannskolen, while from Oslo Hospital to the city center, the line would follow the Gamleby Line.

The plans were sent from the ministry to the municipality, who's council passed the plans on 12 November 1908. Among the conditions were that within five years, the municipality could demand that the line be extended to either Ljabru or Ljan. The concession was again considered on 2 November 1911, and there it was decided that the concession would be removed if the line was not finished by the end of 1914. However, in November 1911, Oslo City Council postponed their permissions while the issue was again made subject to reports on the issue. The report suggested a different route, which ran via Lodalen and up Ekebergsletta
Ekebergsletta
Ekebergsletta is a field in Ekeberg, Oslo, Norway.For most people, Ekebergsletta is known as the place where the Norway Cup started in 1972 and which is still one of many places around Oslo where the game is held....

 at Ekeberg hovedgård. After negotiations, the city agreed to allow the line to follow Kongsveien.

The Labour Party
Norwegian Labour Party
The Labour Party is a social-democratic political party in Norway. It is the senior partner in the current Norwegian government as part of the Red-Green Coalition, and its leader, Jens Stoltenberg, is the current Prime Minister of Norway....

 rejected the line, stating that they did not want any transport that made it easier to live outside the municipal boundary, to keep tax money within the municipality. The final permission from Oslo City Council was granted after a vote with 49 to 35 in May 1913. Concession from the ministry was granted from Sjømannsskolen to Ljan on 7 October, and from Oslo Hospital to Sjømannsskolen on 11 December. On 5 June 1914, permission was granted where the concession was transferred from Thune-Larsen and Helliesen to the company Ekebergbanen, which was founded on 27 March 1914. The company received a share capital of NOK 850,000, later increased to 2.5 million. Engineer Jørgen Barth became the first director.

Since the application, there had been a technological development within tramways. Barth started working with the plans, and proposed that the line be built as a light rail in its own right-of-way, similar to that of the Holmenkollen Line and the Røa Line on the west side of town. This would allow higher speeds. The plans called for the line to run on the east side of Kongsvien until Holtet, after which it would cross the road and continue on the west side Ekebergveien, until it reached Nordstrandsveien. The end of the line would have a balloon loop. After the revised plans were approved by the authorities, construction started in August 1914. Most of the works were finished in 1917. The original line consisted of double track from Oslo Hospital to Sjømannsskolen, and single track from Sjømannsskolen to Sæter. Holtet received a passing loop, in addition to the line's depot. The parish hall at Sæter was bought and made a combined station and office.

Early years

The company bought five bogie
Bogie
A bogie is a wheeled wagon or trolley. In mechanics terms, a bogie is a chassis or framework carrying wheels, attached to a vehicle. It can be fixed in place, as on a cargo truck, mounted on a swivel, as on a railway carriage/car or locomotive, or sprung as in the suspension of a caterpillar...

 trams. They had pointed ends to ease meeting the shorter trams in the city, and had a low-floor center section, with internal steps. The body and mechanical equipment was built by Skabo Jernbanevognfabrikk
Skabo Jernbanevognfabrikk
Skabo Jernbanevognfabrikk was a mechanical workshop focusing on design and construction of railcars. It was established by Hans Skabo in Drammen, Norway in 1864; it became the first rail car factory in the country when it took delivery of the cars for Kongsvingerbanen...

, while the electrical components were built by Siemens-Schuckertwerke. Capacity was for 40 or 38 seated passengers. In early 1917, Barth was replaced by H. A. Mørk as director. Trial runs of the tramway started on 11 June 1917. It was retrospectively decided by the ministry that the official opening date was 1 July.

Initially there were two services per hour, but this quickly turned out to be too little. However, because of World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 and problems receiving supplies from Germany, it was not until November that all five trams were delivered and a 15-minute headway could be introduced. The company also started purchasing land to allow a future double track and widening of the loading gauge
Loading gauge
A loading gauge defines the maximum height and width for railway vehicles and their loads to ensure safe passage through bridges, tunnels and other structures...

 to allow for the wide trams used on the Holmenkollen Line. Also four services per hour proved to be too little. The company had chosen to electrify the line at 1,200 volts instead of the 600 volts used in the rest of the tram network, so the company could not operate rented trams from other operators. The junction between the two networks at Oslo Hospital had a 10 metres (32.8 ft) section without a overhead wires. This allowed both of the pantographs to not touch their wire when the current was switched. When changing between the currents, the lighting, heating, compressor and battery chargers all had to be manually changed with a switch.

In 1919, the company ordered seven new trams from Skabo, with electric equipment from Norsk Elektrisk & Brown Boveri
Norsk Elektrisk & Brown Boveri
Norsk Elektrisk & Brown Boveri A/S also known as NEBB was a Norwegian manufacturing company, which built a large amount of the rolling stock that is used by Norges Statsbaner. The plant was located at Skøyen. In 1988 it merged into Asea Brown Boveri ....

 (NEBB). These were the first in the country to have Norwegian-built electrical equipment, and also allowed for multiple-unit train control
Multiple-unit train control
Multiple-unit train control, sometimes abbreviated to multiple-unit or MU, is a method of simultaneously controlling all the traction equipment in a train from a single location, whether it is a Multiple unit comprising a number of self-powered passenger cars or a set of locomotives.A set of...

. They were delivered in 1920 and 1921. In addition, six trailers were built from Hannoversche Waggonfabrik (HaWA) The delivery of new rolling stock required a new depot building at Holtet, two new electric arc
Electric arc
An electric arc is an electrical breakdown of a gas which produces an ongoing plasma discharge, resulting from a current flowing through normally nonconductive media such as air. A synonym is arc discharge. An arc discharge is characterized by a lower voltage than a glow discharge, and relies on...

 transformers and a ticket price increase. The HaWa trailers were delivered in 1925. However, the two-axled trailers did not give as smooth a ride, and in 1927 the company ordered bogie trailers from Atelier Métallurgique de Nivelles, which were put into service in 1928 and 1929.

To allow more frequent services, the line needed to be rebuilt to double track. The first section was from Sportsplassen to Holtet, which opened with double track on 16 January 1930. Next followed the section from Holtet to Kastellet on 12 February 1931, and finally from Sjømannsskolen to Sportsplassen on 30 September 1931. This occurred at the same time the Simensbråten Line was built, as a branch from Jomfrubråten to Simensbråten. Construction of the Simensbråten Line started in December 1928;
and this resulted in the Ekeberg Line past Jomfrubråten being moved. Instead of following the street Kongsveien, it the line was moved to a higher elevation. The double-tracked Ekeberg Line was placed on the new line, while the single-tracked Simensbråten Line would follow the old route along Kongsveien. The Simensbråten Line would thus cross under the Ekeberg Line and then through a curve turn onto its right-of-way. The Simensbråten Line was completed in mid-1931 and was officially opened on 30 September 1931.

On the city section, the tracks had been gradually rebuilt to allow 2.5 metres (8.2 ft) wide and 15 metres (49.2 ft) long trams to run on the tramway, including the Gamleby Line. In 1930, tram 1003 was rebuilt to that width. It proved too heavy, and Ekebergbanen ordered new trams which were wider. When delivered, they were capable of hauling a 50 tonnes (49.2 LT) tram up the hills at 50 kilometres per hour (31.1 mph).
In 1925, the Østfold Line was rebuilt to double track, and the section past Hauketo was moved, including the demolishing of the Ljan Viaduct. In June 1926, Aker Municipality started the process to demand that the line be extended onwards from Sæter. However, Ekebergbanen stated that the rebuilding of the Østfold Line removed the need of the extension. The company instead applied for concession to extend the line 5 kilometres (3.1 mi) southwards towards Hvervenbukta on Ljanskollen's west side. This was rejected by Aker Municipality. In exchange for not being allowed to extended the line, Aker Municipality agreed to not press the issue of their preferred extension for the time being.

At the time, Akersbanerne
Akersbanerne
A/S Akersbanerne was a municipal owned company that operated tramways in the former Municipality of Aker in current Oslo, Norway. The company was established in 1917, and opened the suburban Østensjø Line tramway in 1926; it took over the majority ownership of Holmenkolbanen in 1933, that owned the...

 was working on building the Lambertseter Line, which is located further east in Aker. This caused an uproar amongst the residents in the Ekeberg area, who wanted the Ekeberg Line extended, in what became known as the thousand meter, before the construction of the Lambertseter Line. The municipality therefore granted free municipal land and a grant of NOK 50,000 for expropriation
Eminent domain
Eminent domain , compulsory purchase , resumption/compulsory acquisition , or expropriation is an action of the state to seize a citizen's private property, expropriate property, or seize a citizen's rights in property with due monetary compensation, but without the owner's consent...

. Construction started in July 1940, after having been delayed by the German occupation of Norway. The construction included a new double track from Holtet to Bråten. During the construction at Sæter, the trams turned at Bråten and backed to Sæter, where they used the turning loop. The thousand meter extension to Ljabru opened on 17 September 1941.

World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 and the limitations on fuel gave the Ekeberg Line a large increase in traffic, from four million passengers in 1939 to eight million in 1944. Unlike many other Norwegian tramways, the tram vehicles were not confiscated and moved to Germany, because no German tramways used both 1,200 volts and allowed 2.5 metres (8.2 ft) wide vehicles. A new depot building was built in 1942 and 1943, which allowed 3.2 metres (10.5 ft) wide trams.

Following the end of the war, it was decided that Oslo and Aker would merge. Ekebergbanen's concession lasted until 30 June 1947, which was initially extended on year. In March 1948, Oslo Sporveier
Oslo Sporveier
Kollektivtransportproduksjon AS is a municipal owned public transport operator of Oslo, Norway, the name meaning simply "public transportation producer". It operates the trackage and maintains the stock of the Oslo Metro and Oslo Tramway, as well as owning eight operating subsidiaries...

, the municipal company that operated among other things the street tramways, offered to purchase Ekebergbanen. All but eight shares were sold, and from December the board of Ekebergbanen and Oslo Sporveier was identical. However, the company retained its own name, administration, rolling stock and personnel.
After the nationalization, the company started a renovation process of the infrastructure and rolling stock. Combined with a municipal policy of low fares, the company started going with a loss. Five new trams were delivered from 1948 to 1952, and built at the depot at Holtet, with used equipment from some of the older trams. An additional nine new trams were delivered between 1952 and 1955. Five additional trams were rebuilt from 1955 to 1960, by which time all the narrow trams had been rebuilt or retired. The use of a unique voltage gave operational difficulties, as fuses could regularly blow at Oslo Hospital if errors where done while switching from the one supply to the other. In addition, all the trams were custom-built with extra equipment with limited spare parts. All the trams delivered during the 1950s were built so they could later be converted to only use 600 volt supply. The depot was expanded in 1952.

Threat of closure and renewal

In 1960, the Oslo City Council voted to close the street tramway and replace all routes with either diesel buses or the Oslo Metro. The specific plans for the Ekeberg Line were not decided, although the line was considered either to be a stand-alone light rail or connected to the metro. From 30 October 1960, the route for the Ekeberg Line trams in the city changed, so they instead followed the route Schweigaards gate – Vognmannsgata – Jernbanetorget – Kirkeristen to Stortorvet instead of the old route via Grønland
Grønland
Grønland is a neighbourhood in central Oslo, Norway. It is served by several tram and bus lines, as well as the Oslo Metro at the Grønland Station....

 and Brugata. From 1963, the route terminated at Jernbanetorget
Jernbanetorget (station)
Jernbanetorget is both a rapid transit station on the Oslo Metro and a light rail station of the Oslo Tramway. The metro station is in the Common Tunnel used by all lines under the city centre. It is located between Stortinget to the west and Grønland to the east. Until the construction of the...

, after the rest of the route was closed due to the construction of the metro.

From 1 July 1965, Oslo Sporveier took over the operation of the Ekeberg Line, which was numbered Line 16. Oslo Sporveier took over all employees and rolling stock, but Ekebergbanen remained a holding and real estate company. Immediately following the take-over, Oslo Sporveier introduced a 20-minute headway and suggested that the line be closed and replaced by buses from 29 October 1967, when the Østensjø Line of the metro opened. Following the closing of Sagene Ring
Sagene ring
Sagene ring is a former tramway in Oslo, Norway. The route was operated as line 0 of the Oslo Tramway between 1916 and 1954. The line went from the depot behind Sagene Church along Nordre Gravlund, Geitmyrsveien, Colletts gate, Ullevålsveien, Akersgaten, Karl Johans gate, via Stortorvet, Storgata,...

, there were increased protests against closing the tramway. Traffic had decreased on the Ekeberg Line, but proponents for keeping it stated that this was because Oslo Sporveier had reduced the frequency and moved the end station out of the core of the city center. When the proposal to close the Ekeberg Line was considered by the city council, it was decided that only the Simenbråten Line was to be closed.

In 1960, the sale of cars in Norway was deregulated and the management of the public transport system was changed to become that of providing services to those who could not drive their own car. The Ekeberg Line lost traffic because it did not operate to the city center, and with the 1960 decision in the city council was it not permissible to lay new tracks to Stortorvet. Therefore, locals suggested that the trams continue along the track from Jernbanetorget to Skøyen, on the west side of town. At first the proposal was rejected by Oslo Sporveier because it was "technically impossible".

From June 1967, Line 9, that ran along the Lilleaker Line via the Skøyen Line
Skøyen Line
The Skøyen Line is a tramway line running from Slottsparken to Skøyen in Oslo, Norway. It is served by line 13 of the Oslo Tramway. It connects the Briskeby Line at Slottsparken to the Lilleaker Line at Skøyen....

 to the city center and onwards along the Østensjø Line, was truncated to Jernbanetorget, as the Østensjø was converted to a metro line. Calculations showed that if the Lilleaker Line or the Skøyen Line and the Ekeberg Line were connected, between them one tram less would be needed, and the Ekeberg Line would have a service through the city center. After trial runs, the new service to Skøyen was taken into use on 4 May 1969.

In 1973, Oslo Sporveier again proposed closing the Ekeberg Line. This time the reason was the construction of the Oslo Tunnel and Oslo Central Station, which would involve construction work around Jernbanetorget. This proposal also resulted in a public reactions, and the same arguments from the mid-1960s were repeated. Again the suggestion to link the Lilleaker Line to the Ekeberg Line were launched. Oslo Sporveier calculated it would cost NOK 3.6 million for investments, including rebuilding 20 Gullfisk trams, new rectifier
Rectifier
A rectifier is an electrical device that converts alternating current , which periodically reverses direction, to direct current , which flows in only one direction. The process is known as rectification...

s and new tracks. This was less than the necessary 30 buses needed for conversion to bus services.

The last of the older Ekeberg Line trams to Skøyen ran on 5 August 1973. From the following day, all trams turned at a new balloon loop at Vognmannsgata. Investments included a new track at Holtet Depot, and 500 metres (1,640.4 ft) of new double track in its own right-of-way along Biskop Gunnerus gate from Postgirobygget
Postgirobygget (building)
Postgirobygget is a commercial building located at Biskop Gunnerus' gate 14 in Oslo, Norway.The building was designed by Norwegian architect Rolf Christian Krognes and constructed in 1975....

 to Kirkeristen. A double track from Sæter to Ljabru was discarded because there was no need for it. The last of the old trams ran on 22 September, and from 24 September the line was switched from 1,200 to 600 volts. Ordinary service with Gullfisk trams from Ljabru to Jar
Jar (station)
-External links:*...

 on the Lilleaker Line started on 29 September. The new service involved a 10-minute headway at daytime and a 20-minute headway during the evenings.

In 1976, a Gullfisk lost control on the line and derailed near Sjømansskolen, causing the tram to be scrapped. From 1977, Oslo Sporveier also put SM53
SM53
The SM53, also called Høka trams after the manufacturer Hønefoss karosserifabrikk, were a tram model which operated for more than 40 years on the Oslo Tramway. A number of these trams were later rebuilt and became known as SM83 trams....

 trams into service. This was not sufficient, and Oslo Sporveier considered introducing the old Ekeberg Line trams. But this would be costly, as the vehicles would have to be upgraded. Instead, used MBG trams from the Gothenburg Tramway
Gothenburg tram
The Gothenburg tram network is part of the public transport system organised by Göteborgs Spårvägar AB, controlled by Västtrafik in the Swedish city of Gothenburg...

 were put into service. The section from Sæter to Ljabru had since the opening had a signaling system that had worked fine with 15- and 20-minute headways, but did not work properly with 10-minute routes. A new system was installed, and proved to work just as poorly as the old system. During 1979, the section was rebuilt to double track, although the short bridge over Nordstrandsveien was kept single tracked.

In 1982 and 1983, the SL79 articulated trams were introduced on the line. In 1988, the line to Jar was supplemented with a rush-hour route which connected with the Ullevål Hageby Line
Ullevål Hageby Line
The Ullevål Hageby Line is a light rail section of the Oslo Tramway. It runs from Stortorvet in the city center of Oslo, Norway to Rikshospitalet. It passes through the areas of St. Hanshaugen, Ullevål Hageby and Blindern before reaching Gaustad...

 west of Oslo. From 28 August 1988, a service started running from Ljabru and connecting with the Ullevål Hageby Line. Weekend night services started operating from 18 November 1989. From 1988 to 1991, the section of the Gamleby Line along Schweigaards gate was rebuilt to light rail standard in its own right-of-way. In this period, the line received new catenary
Overhead lines
Overhead lines or overhead wires are used to transmit electrical energy to trams, trolleybuses or trains at a distance from the energy supply point...

 and many stations were renovated. The new section was taken into use on 4 January 1991. Along with the rest of the tram system the voltage was increased to 750 volts on 4 June 2000. This allowed the new SL95 low-floor trams to operate on the line. In 2002 the board of Oslo Sporveier proposed closing the Ekeberg Line along with the Kjelsås Line
Kjelsås Line
The Kjelsås Line is a tramway line running from Storo to Kjelsås in the norther part of Oslo, Norway. The line opened by Oslo Sporveier on 25 September 1934 as an extension of the Grünerløkka–Torshov Line that terminated at Storo. It is served by line 11 and 12 of the Oslo Tramway operated by Oslo...

, but this was stopped by the general assembly.

Future

The Ekeberg Line is proposed extended from Ljabru to Hauketo Station
Hauketo Station
Hauketo Station is a railway station at Nordstrand in Oslo, Norway. Located on the Østfold Line, it is served by the Oslo Commuter Rail line 500, operated by Norges Statsbaner with two hourly services. The station was opened in 1925.-External links:*...

 on the Østfold Line. To routes have been proposed, either along Ekebergveien, or in a tunnel further east. The extension will allow better correspondence southwards, including transfer to the Oslo Commuter Rail
Oslo Commuter Rail
Oslo Commuter Rail is a commuter rail centered in Oslo, Norway, connecting the capital to six counties in Eastern Norway. The system is operated by the Norwegian State Railways and its subsidiary NSB Gjøvikbanen, using Class 69 and Class 72 electric multiple units . The network spans eight routes...

 and Ruter buses. Financing has been secured through Oslo Package 3.

As part of the Fjord City
Fjord City
The Fjord City is a urban renewal project for the waterfront part of the center of Oslo, Norway. The first redevelopment was at Aker Brygge during the 1980s. Bjørvika and Tjuvholmen followed up during the 2000s, while the remaining parts of the Port of Oslo will be developed in the 2010s. The port...

 and redevelopment of Bjørvika
Bjørvika
Bjørvika is a neighborhood in the Sentrum borough of Oslo, Norway. The area is an inlet in the inner Oslofjord, situated between Gamlebyen and Akersness. It serves as an outlet for the river Akerselva. Since the 2000s, it has been undergoing urban redevelopment, being transformed from a container...

, the Ekeberg Line has been proposed to follow a new line on the south side of Oslo Central Station to Jernbanetorget, with stops at Sørengautstikkeren
Sørengautstikkeren
Sørengautstikkeren is a neighborhood in the borough Gamle Oslo in Oslo, Norway. It is an artificial peninsula that sticks out into the Oslofjord form Bjørvika and Sørenga. It is part of the Port of Oslo, but will be redeveloped as part of the Fjord City urban redevelopment program, after the...

and Bjørvika. As an alternative, it has been proposed that the tracks along Schweigaards gate be kept and that the trams along the Ekeberg Line alternate running via Bjørvika and Schweigaards gate.
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