Sofia Metro

The Sofia Metro (Bulgarian: Софийски метрополитен, translit. Sofiyski metropoliten, also colloquially called Софийско метро, translit. Sofiyskо metro) is the rapid transit network servicing the Bulgarian capital city Sofia. It began operation on 28 January 1998.[1] As of July 2016, the Sofia Metro consists of two interconnected lines, serving 35 stations, with a total route length of 40.0 kilometres (24.9 mi)[1][5][6][2] being among the top 30 of the most extensive European metro systems. The Metro links the densely populated districts of Lyulin – Mladost (Line 1 – Red) and Nadezhda – Lozenets (Line 2 – Blue), and serves the Sofia Airport.[7][8]

Sofia Metro
Overview
Native nameСофийски метрополитен
Sofiyski metropoliten
OwnerCity of Sofia
LocaleSofia, Bulgaria
Transit typeRapid transit
Number of lines2[1]
Number of stations35[1][2]
Daily ridership350,000 (2019)[3]
Chief executiveStoyan Bratoev
Headquarters121, Knyaz Boris I str.
WebsiteMetropolitan.bg
Operation
Began operation28 January 1998 (1998-01-28)[1]
Operator(s)Metropoliten JSC
Number of vehicles52
Technical
System length40.0 km (24.9 mi)[1][2]
Track gauge1,435 mm (4 ft 8 1⁄2 in) standard gauge
Electrification825V DC (third rail, lines 1, 2), 1500V DC (overhead lines, line 3)
Average speed40 km/h (25 mph)[4]
Top speed80 km/h (50 mph)

History

Planned since the 1960s, construction of the Metro was not officially launched until the late 1990s mainly because the city did not experience an urgent need for an underground system in addition to the stalled construction due to lack of sufficient funding. Another factor was the depth at which the construction works had to be carried out: being one of the oldest cities in Europe, Sofia contains many historical layers underneath its central areas. Evidence of antiquity can be clearly seen at the Serdika Station which exhibits a wealth of unearthed Thracian and Roman ruins and modern architecture. During the construction of the enormous complex of the National Palace of Culture two stations forming part of the then future Line 2 and their connecting tunnels were built.

The construction of the system began from the route that sees the highest volumes of passenger traffic, that can easily reach up to 38,000 at rush hour.[9]

Lines

Due to an increased population, there are a large number of passengers heading toward the city center during weekday mornings, and away from the city centre in the weekday evenings. The necessity of efficient public transport in the direction of the largest passenger flows, transport, and Sofia's environmental problems precipitated the start of the construction of the Sofia Metro. Following the ratification of a technical and economic report on the metro by the Council of Ministers of Bulgaria, and the subsequently approved General City Plan, the general scheme for the development of the lines should consist of three diameters with extensions in the periphery, with a total length of 62 kilometres (39 mi), 63 metro stations, and a 1.1 million daily passenger capacity at the final stage of implementation.[10]

Line Opened Current length
(km [mi])		 Current stations U/C length
(km [mi])		 U/C stations Planned length
(km [mi])		 Planned stations
1 1998 28 (17.4) 23 – – 30.9 (19.2) 25
2 2012 12 (7.5) 12 – – 18 (11.2) 18
3 U/C – – 12 (7.5) 12 18 (11.2) 18
Total: 40 (24.9) 35 12 (7.5) 12 66.9 (41.6) 61

Map


First Line M1 – Red line
Line 1
All stations are wheelchair accessible
Line 2
 Obelya Depot
 Slivnitsa
Lyulin
Zapaden Park
Suhodolska River
 Vardar
Konstantin Velichkov
Vladayska River
 Opalchenska
Line 2
 Serdika
Line 2
 SU St. Kliment Ohridski
Perlovska River
 Vasil Levski Stadium
Joliot-Curie
Novachitsa River
 G.M.Dimitrov
Musagenitsa
Darvenishka River
 Mladost 1
Line 2
 Aleksandar Malinov
Akademik Aleksandar
Teodorov - Balan
Banishka River
 Business Park Sofia
 Sofia Park
Banishka River
 Malinova Dolina
Station names in italics
are not confirmed.
Detailed track map
 RED line – BLUE line
Moderno predgradie
(proposed)
National Rail
to Dragoman/Radomir/Bankya
 
↑Opened 2003↑
to Depot
 
↓Opened 1998↓
0'
 Slivnitsa
2'
 Lyulin
4'
 Zapaden Park
Suhodolska
National Rail
to Pernik-Kulata/Kyustendil
7'
 Vardar
9'
 Konstantin Velichkov
 
↓Opened 1999↓
Vladayska
11'
 Opalchenska
 
↓Opened 2000↓
13'
 Serdika
Serdika II
BLUE line M2
to Obelya/Vitosha
 
↓Opened 2009↓
15'
Perlovska
17'
 Vasil Levski Stadium
21'
 Joliot-Curie
WTC
Novachitsa
23'
 G.M.Dimitrov
24'
 Musagenitsa
Darvenishka
26'
 Mladost 1
00'
to AIRPORT
 
00'
 
↓Opened 2012↓
 
29'
 Mladost 3
31'
 
↓Opened 2015↓
33'
 Druzhba
36'
 Iskarsko shose
National Rail
to Ihtiman/Karlovo
38'
 Sofiyska Sveta gora
40'
 Sofia Airport
Terminal 2
Airport branch end
00'
 
↓Opened 2015↓
 
28'
 Aleksandar Malinov
30'
Banishka
32'
 Business Park Sofia
Mladost branch end

The first 6.5 kilometres (4.0 mi) long section of line 1 consisting of five stations linking Slivnitsa Boulevard through Lyulin and K. Velichkov Boulevard was inaugurated on 28 January 1998. Opalchenska station entered into service on 17 September 1999 and Serdika station situated on St Nedelya Square followed on 31 October 2000, extending the total system length to 8.1 kilometres (5.0 mi). The operational section of the line was further extended with a 1.8 kilometres (1.1 mi) long section, reaching Obelya housing estate in April 2003.

The extension of Line 1 continued in 2005 with the start of the construction of 4.8 kilometres (3.0 mi) of tunnels and three stations linking St Nedelya Square and the Interped World Trade Center in Izgrev (station Frédéric Joliot-Curie). 2006 saw the start of the construction of another section of the same line (consisting of 3.2 kilometres (2.0 mi) of tunnels and three stations) linking Izgrev and Mladost I housing estate. The completion of the first three stations was projected for the autumn of 2007, however as a result of various delays it was the second section from the first line (Vasil Levski stadium – Mladost 1) that first entered into service on 8 May 2009, operating for a brief period of time separately from the north-west portion of the line. The remaining section between Serdika and Vasil Levski stadium station finally entered into service on 7 September 2009[11] establishing an uninterrupted link between Obelya and Mladost 1 stations.

The construction of the stretch from Mladost I to Business Park Sofia station (2.62 kilometres (1.63 mi), three underground stations) began on 25 April 2013, and was completed on 8 May 2015.[6][12] It cost BGN 85,767,683 (EUR 43,852,320), VAT exclusive, and serves the majority of the second most densely populated area in Sofia.[13][14]

Main Line
StationImageIn service sinceNotes
Slivnitsa (Сливница)28 January 1998servicing Lyulin housing estate
Lyulin (Люлин)28 January 1998servicing Lyulin housing estate
Zapaden Park (Западен парк)28 January 1998situated near Mega Mall Sofia and servicing Lyulin housing estate
Vardar (Вардар)28 January 1998servicing Zapaden Park housing estate
Konstantin Velichkov (Константин Величков)28 January 1998situated on Konstantin Velichkov boulevard
Opalchenska (Опълченска)17 September 1999situated near Mall of Sofia
Serdika (Сердика)31 October 2000Situated near the city's ideal centre; transfer station between the Red (M1) and Blue (M2) lines
St. Kliment Ohridski Sofia University (СУ „Св. Климент Охридски“)7 September 2009situated near Sofia University
Vasil Levski Stadium (Стадион „Васил Левски“)8 May 2009situated near Vasil Levski National Stadium
Joliot-Curie (Жолио Кюри)8 May 2009servicing Iztok and Izgrev housing estates
G.M.Dimitrov (Г. М. Димитров)8 May 2009servicing Musagenitsa, Dianabad, Studentski grad and Darvenitsa housing estates
Musagenitsa (Мусагеница)8 May 2009servicing Musagenitsa housing estate
Mladost 1 (Младост 1)8 May 2009transfer station between the northern (Sofia Airport) and the southern (Business Park) branch. Servicing Mladost 1 housing estate
Aleksandar Malinov (Александър Малинов)8 May 2015servicing Mladost 2 and Mladost 3 housing estate
Akad. Aleksandar Teodorov-Balan (Акад. Александър Теодоров-Балан)8 May 2015servicing Mladost 2 and Mladost 3 housing estate
Business Park Sofia (Бизнес Парк София)8 May 2015situated near Business Park Sofia and servicing Mladost 4 housing estate
Sofia Park (София парк)plannedwill be situated near residential district Sofia Park (ж.к. "София парк") and Sofia Ring Road[15]
Malinova Dolina - Sofia Ring Mall (Малинова долина - София Ринг Мол)plannedwill be situated near Sofia Ring Mall and Sofia Ring Road[16]

Second Line M2 – Blue Line
Line 2
All stations are wheelchair accessible
Moderno predgradie
(proposed)
Obelya
Lomsko shose
Slivnitsa
Beli Dunav
Lyulin
Nadezhda
Zapaden Park
Han Kubrat
Vardar
Knyaginya Maria Luiza
Konstantin Velichkov
Central Railway
Opalchenska
Lavov most
↖Serdika↘
↙Serdika II↗
NDK
SU St. Kliment Ohridski
European Union
Vasil Levski Stadium
James Bourchier
Joliot-Curie
Vitosha
G.M.Dimitrov
 Musagenitsa
 Mladost 1
Line 1
Aleksandar Malinov
Mladost 3
Akademik Aleksandar
Teodorov - Balan
Inter Expo Center –
Tsarigradsko shose
Business Park Sofia
Druzhba
 Iskarsko shose
Sofiyska Sveta gora
 Sofia Airport
Detailed track map
line end
-8'
 Vitosha
 
↑Opened 2016↑
-6'
 James Bourchier
-4'
 European Union
built 1981
opened 2012
Perlovska
-2'
 NDK
built 1981
opened 2012
Serdika
RED line M1
to Slivnitsa/Business Park Sofia
0'
 Serdika II
Vladayska
2'
 Lavov most
3'
 Central Railway Station
5'
 Knyaginya Maria Luiza
BDŽ National Rail
to Pernik-Kulata/Kyustendil
BDŽ National Rail
to Dragoman/Radomir/Bankya
00'
Future extension
 
00'
Ilyantsi branch
Lev Tolstoy
Svoboda
Iliyansko shose
Ilyantsi
Ilyanysi branch end
7'
 Han Kubrat
Suhodolska
9'
 Nadezhda
11'
 Beli Dunav
13'
 Lomsko shose
↑Opened 2012↑
 
15'
 Obelya
Kakach
Moderno predgradie
(proposed)
National Rail
to Dragoman/Radomir/Bankya
 
↑Opened 2003↑
 RED line
to Depot
 
↓Opened 1998↓
-13'
 Slivnitsa
-11'
 Lyulin
-8'
 Zapaden Park
Suhodolska
National Rail
to Pernik-Kulata/Kyustendil
-6'
 Vardar
-4'
 Konstantin Velichkov
 
↓Opened 1999↓
Vladayska
-2'
 Opalchenska
 
↓Opened 2000↓
0'
 Serdika
Serdika II
BLUE line M2
to Obelya/Vitosha
 
↓Opened 2009↓
3'
Perlovska
5'
 Vasil Levski Stadium
8'
 Joliot-Curie
WTC
Novachitsa
10'
 G.M.Dimitrov
12'
 Musagenitsa
Darvenishka
14'
 Mladost 1
00'
to Business Park
 
00'
 
↓Opened 2015↓
 
16'
 Aleksandar Malinov
18'
Banishka
20'
 Business Park Sofia
Mladost branch end
00'
 
↓Opened 2012↓
 
16'
 Mladost 3
18'
 
↓Opened 2015↓
20'
 Druzhba
23'
 Iskarsko shose
National Rail
to Ihtiman/Karlovo
25'
 Sofiyska Sveta gora
27'
 Sofia Airport
Terminal 2
Airport branch end

The second line of the Sofia Metro links the districts of Obelya, Nadezhda, the city centre and Lozenets to the south of the city.[17] Half of the construction cost was covered by the European Union, with the remaining part funded by the state and city budgets.[17] Construction of the 6.4 km (4.0 mi) section between Nadezhda interchange and Lozenets district via Central railway station and the National Palace of Culture started on 14 December 2008. Work on the section between Obelya residential District and Nadezhda started in February 2010. Both sections of the line entered into service on 31 August 2012.[17]

NDK and European Union stations and their connecting tunnels were partly completed during the construction of the National Palace of Culture and the redevelopment of the surrounding area in the late 1970s and early 1980s.

The construction of Mladost 3 and Inter Expo Center - Tsarigradsko chaussée stations began on 15 February 2009 and was completed on 25 April 2012. The further extension to Sofia Airport comprising two underground and two overground stations and a length of 4.968 kilometres (3.087 mi) began in 2013,[12][18][19][20] and was completed on 2 April 2015 at the cost of BGN 136,757,630 (EUR 69,923,066), VAT exclusive.[7][8] This extension was briefly operated as a branch of Line 1, but was soon transferred to Line 2, moving that line's terminus from Obelya to Sofia Airport.

On 20 July 2016, the line was extended southward with 1.3 km (0.81 mi) and one station, Vitosha, located at Hladilnika neighbourhood.[2] The construction took 2 years.

Provisions have been made for the construction of future branch to Iliyantsi, starting from the existing junction located between Knyaginya Maria Luiza and Han Kubrat stations.

Main Line
StationImageIn service sinceNotes
Obelya (Обеля)20 April 2003Set to be used as a link between the depot and line M2.Servicing Obelya, Vrabnitsa and Moderno Predgradie housing estates
Lomsko shose (Ломско шосе)31 August 2012servicing Vrabnitsa housing estate
Beli Dunav (Бели Дунав)31 August 2012situated on the border between Nadezhda 3 and Nadezhda 4 housing estates
Nadezhda (Надежда)31 August 2012servicing Nadezhda housing estate and situated on Lomsko shose
Han Kubrat (Хан Кубрат)31 August 2012situated on the border between Nadezhda 1 and Nadezhda 2 housing estates
Knyaginya Maria Luiza (Княгиня Мария Луиза)31 August 2012situated near Klementinska hospital
Central Railway Station (Централна ж.п. гара)31 August 2012situated near Sofia Central Station and Central Bus Station Sofia
Lavov Most (Лъвов мост)31 August 2012situated near Lavov Most
Serdika II (Сердика II)31 August 2012transfer station between the Red (M1) and Blue (M2) lines
National Palace of Culture (Национален дворец на културата )31 August 2012situated to the north of the National Palace of Culture
European Union (Европейски съюз)[21]31 August 2012situated near the Earth and Man National Museum and City Center Sofia
James Bourchier (Джеймс Баучер)31 August 2012servicing Lozenets housing estate
Vitosha (Витоша)20 July 2016situated next to the Paradise Center; servicing Hladilnika housing estate
Cherni vrah (Черни връх)plannedwill be situated near boul. Cherni Vrah and residential district Krastova vada (кв. „Кръстова вада“)
Dragalevtsi (Драгалевци)plannedwill be situated near boul. Cherni Vrah and Sofia Ring Road

Sofia Airport branch
StationImageIn service sinceNotes
Mladost 3 (Младост 3)25 April 2012servicing Mladost 3 housing estate
Inter Expo Center - Tsarigradsko shose (Интер Експо Център - Цариградско шосе)25 April 2012situated on Tsarigradsko shose
Druzhba (Дружба)2 April 2015servicing Druzhba 1, Druzhba 2, and Iskar housing estates
Iskarsko shose (Искърско шосе)2 April 2015situated near Iskar railway station within Iskar housing estate
Sofiyska Sveta Gora (Софийска Света гора)2 April 2015situated in industrial area "Iskar" within Iskar housing estate
Sofia Airport (Летище София)2 April 2015situated near Sofia Airport with direct connection to Terminal 2

Iliyantsi branch (planned)
StationImageIn service sinceNotes
Tolstoy (Толстой)plannedwill be servicing the Tolstoy housing estate
Svoboda (Свобода)plannedwill be servicing the Svoboda housing estate
Rozhen (Рожен)plannedwill be servicing area near Iliyantsi shopping center
Iliyantsi (Илиянци)plannedwill be servicing Iliyantsi housing estate

Third Line M3 – Green Line
Line 3
Gorna Banya
Ovcha Kupel
New Bulgarian University
Miziya
Vladayska River
Tsar Boris III/Krasno Selo
Boyanska River
Bulgaria
Medical University
NDK II
St. Patriarch Evtimiy
Orlov Most
Perlovska River
Teatralna
Hadzhi Dimitar
Georgi Asparuhov Stadium
Trakiya
Vladimir Vazov

The 16 km (9.9 mi) long third line is planned to connect Ovcha Kupel neighbourhood (in southwest Sofia) and Vasil Levski neighbourhood (in northeast Sofia), with 16 stations in total, including two transfer stations in the city centre, with both of the already operational lines. The line should be put into service by the start of 2020.[22]

There will be 8 overground and 11 underground stations. The project design contract was awarded to the Czech company Metroprojekt Praha a.s.[23][24][25]

In March 2014, a tender for construction of the central section of the line was announced. The section is 7 km (4.3 mi) long and includes 7 stations, two of them transfer to lines 1 and 2. With the announcement of the tender it became clear, that the initial plans for 19 stations had been partly amended and 2 of the stations will be not be built, one at Doyran boulevard and another at Shipka street. The tunnel of the central section shall be excavated by a TBM, while the construction of stations shall be awarded to other companies. The construction of the section shall be completed within 45 months.[26] In January 2015, a tender for 20 trains, that shall serve the central section of the line, was announced. Driverless train operation, with Grade of Automation 3 (GoA 3), and platform screen doors will ensure the safety of the passengers. Unlike lines 1 and 2, where the trains collect power through a third rail, line 3 trains will be equipped with pantographs.[27][28] CAF and Siemens applied bids in the tender for the trains,[29] with Siemens winning it.[30]

In early 2016 construction began on the third metro line of the Sofia Metro using the technology for classic underground metro with high-power support. Under construction are all metro stations in the central section, plus a few in the west and east of downtown Sofia. The third line of Sofia Metro will have a total of 23 metro stations, as follows 16 metro stations for the Main Line and 7 metro stations for the Eastern branch.[31][32][33]

Main Line
StationImageIn service sinceNotes
Vladimir Vazov (Владимир Вазов)plannedWill be servicing Vasil Levski housing estate
Trakiya (Тракия)plannedWill be servicing Suhata Reka housing estate
"Georgi Asparuhov" Stadium (Стадион „Георги Аспарухов”)plannedWill be servicing Stefan Karadzha housing estate near Georgi Asparuhov Stadium
Hadzhi Dimitar (Хаджи Димитър)Summer 2020 (expected)[34]Will be servicing Hadzhi Dimitar housing estate. U/C since 2016
Teatralna (Театрална)Summer 2020 (expected)[34]Will be servicing Vladimir Zaimov and Oborishte housing estates. U/C since 2016
Orlov Most (Орлов мост)Summer 2020 (ready, but expected)[34]Will be servicing Orlov Most and Borisova Garden area, transfer station between the Green (M3) and Red (M1) lines. U/C since 2016
St. Patriarh Evtimiy (Св. Патриарх Евтимий)May 2020 (expected)[34]Will be servicing area near Odeon cinema. U/C since 2016
NDK II (НДК II)May 2020 (expected)[34]Will be servicing the National Palace of Culture, transfer station between the Green (M3) and Blue (M2) lines. U/C since 2016
Medical University (Медицински университет)May 2020 (ready, but expected)[34]Will be servicing the Medical Academy and Kriva Reka housing estate. U/C since 2016
Bulgaria (България)May 2020 (ready, but expected)[34]Will be servicing Hipodruma and Strelbishte housing estate. U/C since 2016
Tsar Boris III/Krasno Selo (Цар Борис III/Красно Село)May 2020 (ready, but expected)[34]Will be servicing Slavia, Lagera, Krasno Selo and Belite Brezi housing estates. U/C since 2016
Miziya (Мизия)Under Construction (2020)Will be servicing Ovcha Kupel 1 housing estate
New Bulgarian University (Нов Български Университет)Under Construction (2020)Will be servicing Ovcha Kupel housing estate
Ovcha Kupel (Овча Купел)Under Construction (2020)Will be servicing Ovcha Kupel 2 housing estate
Gorna Banya (Горна Баня)Under Construction (2020)will be servicing Gorna Banya housing estate

Eastern branch (planned)
StationImageIn service sinceNotes
Sitnyakovo (Ситняково)plannedwill be servicing Poduyane and Yavorov housing estates
Geo Milev (Гео Милев)plannedwill be servicing Geo Milev and Reduta housing estates
Slatina (Слатина)plannedwill be servicing Slatina and Hristo Smirnenski housing estates
Asen Yordanov (Асен Йорданов)plannedwill be servicing the area near "CSKA Cherveno Zname" sports center
Arena Armeec (Арена Армеец)plannedwill be servicing the Arena Armeec sports hall and Sofia Tech Park
Poligona - The Mall (Полигона - Дъ Мол)plannedwill be servicing the area near The Mall (Sofia) and Poligona housing estate

Fares and ticketing

The price of a single ticket is 1.60 lev, equivalent to ~0.82 euro. It can be issued either by a cashier, or by a vending machine. When obtained, the single ticket must be validated within 30 minutes at a validator. Pre-paid RFID (MIFARE Classic) card also could be bought (at a price of 2 levs) with minimum 10 pre-paid rides (at a price of 12 levs for 10 pre-paid rides). Daily and monthly cards are also available.[35]

Rolling stock
An 81-740/741 Rusich train at Serdika station
A Siemens Inspiro train during InnoTrans 2018.

The system uses two types of rolling stock, both made in Russia.

The older train sets, type 81-717/714, have been manufactured by Metrovagonmash in Mytishchi near Moscow and consisted of 48 carriages in total. They were delivered in 1990 – some 8 years prior to the opening of the first section of the system. In 2020 the first train sets of this type were overhauled and went into service.[36]

The second generation of rolling stock, type 81-740/741 "Rusich", have also been manufactured by Metrovagonmash. The delivery of this type commenced in 2005. With line M2 now in service, 40 more trains of this type were delivered by the end of 2013.[17]

The third generation of rolling stock, Siemens Inspiro 20 three-car sets were delivered in 2018. 3.[37]

Ridership
Sofia Metro ridership
Year Passengers per day Change Metro Stations
199810,000[38]Initial 5
199940,0006
200070,000[38]70.07
200180,0007
200290,000[39]28.67
200380,000[9]11.18
200475,0008
200570,000[40]12.58
200680,0008
200790,000[41]28.68
200876,000[42]15.68
2009201,000[43]264.514
2010187,000[44]7.014
2011190,000[45]1.614
2012350,000[46]84.227
2013280,000[47]20.027
2014320,000[47]14.327
2015335,000[48]4.734
2016350,000[48](proposed)4.535
2017350,000[3]35
2018350,000[3]35
2019350,000[3]35
202035

See also

References
  1. "General Info about Sofia Metro". MetroSofia.com. 2013. Retrieved 20 September 2013.
  2. "Sofia subway launches 1.3 km section with one station". See News. 20 July 2016.
  4. "Открит е нов участък от софийското метро – МС "Цариградско шосе" – МС "Летище София" (in Bulgarian). Метрополитен София. Archived from the original on 27 January 2016. Retrieved 19 January 2016.
  5. "Председателят на комисията Жозе Мануел Барозу ще пререже лентата на втория лъч на подземната железница" [We want the [European Commission (EC)] 800 million for the third metro line] (in Bulgarian). Строител. 30 July 2012. Retrieved 20 September 2013.
  6. "Subway Extension to Business Park Sofia Opens". Novinite. 8 May 2015.
  7. "Subway Trains to Sofia Airport Start Running at 1 pm on April 2". novinite.com. 2 April 2015. Retrieved 7 April 2015.
  8. "Sofia airport metro link opens". Railway Gazette International. 7 April 2015. Retrieved 7 April 2015.
  9. Metropolitan Sofia – General Information
  10. "Metropolitan Sofia – General Scheme". Archived from the original on 16 July 2017. Retrieved 2 August 2013.
  11. "Sofia Metro links east and west Sofia suburbs". Sofia Echo. 7 September 2009.
  12. Stoyanov, Assen (2 March 2015). "Testing begins on Sofia metro extensions". International Railway Journal. Retrieved 1 April 2015.
  13. Public Procurement Agency Portal - L1 S. Branch Construction
  14. Public Procurement Agency Portal - L1 S. Branch Supervision
  15. Спаси метрото
  16. "Sofia Municipal Expert Spatial Development Council (MESDC)" (PDF). Archived from the original (PDF) on 18 May 2015. Retrieved 19 April 2015.
  17. "Free rides celebrate opening of Sofia metro Line 2". Railway Gazette International. 31 August 2012.
  18. Public Procurement Agency Portal - L1 N. Branch Construction Positions 1 & 2
  19. Public Procurement Agency Portal - L1 N. Branch Construction Position 3
  20. Public Procurement Agency Portal - L1 N. Branch Supervision
  21. http://media.snimka.bg/s1/0817/027878246.jpg
  22. https://www.novinite.com/articles/203047/When+will+the+Third+Sofia+Metro+Line+be+Launched%3F
  23. O.P. Transport: Third Metro Diameter Archived 20 August 2012 at the Wayback Machine (in Bulgarian) BNT, 29 November 2011. Retrieved 30 Sep 2012.
  24. Metroprojekt – History (2011–Future) Archived 30 March 2014 at the Wayback Machine Metroprojekt.cz – Retrieved 30 September 2012.
  25. METRORAIL 2013 Presentation Archived 30 March 2014 at the Wayback Machine Metroprojekt.cz
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  27. "Кметът на гр. София провери напредъка в изпълнението на участък "Младост 1 – бул. Цариградско шосе"" (in Bulgarian). Metropoliten. Archived from the original on 6 June 2012. Retrieved 31 March 2015.
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  31. Метрото за „Слатина“ ще тръгва от „Орлов мост“ и ще стига до The Mall
  32. Разклонението на третия метролъч ще тръгва от "Орлов мост" и ще стига до The Mall
  33. 243 млн. лв. за строителство на 12 метростанции и 12 километра трасе през 2017 г.
  34. https://sofiaglobe.com/2019/08/02/sofia-metro-line-3-opening-delayed-to-february-2020/
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  37. Newag and Siemens present first Sofia Line 3 metro train
  38. Стоян Братоев Софийски метрополитен. — София: Нота Бене, 2004. — p. 61 — ISBN 954-91420-1-9
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  47. Столичното метро ще се движи на по-чести интервали от април
  48. New Sofia Metro Station Opens, Adding 15 000 Passengers - See more at: http://www.novinite.com/articles/175553/New+Sofia+Metro+Station+to+Open%2C+Adding+15+000+Passengers#sthash.TmfyPRaE.dpuf
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