There were 13 metro systems in 7 of the 15 Soviet republics just before the dissolution of the Soviet Union in 1991. A 14th metro system, the Dnipro Metro, started construction in 1982, but due to financial difficulties was not opened until 1995. Other than in Dnipro, the only metro systems built in the post-Soviet states after 1991 are Kazan Metro in Russia (2005) and Almaty Metro in Kazakhstan (2011). Additionally the Volgograd Metrotram and Kryvyi Rih Metrotram are two metrotram systems with elements of metro, opened in 1984 and 1986 respectively.
^Московский метрополитен [Moscow Metro] (in Russian). Moskovsky Metropoliten. Retrieved 3 March 2014.
^ ab"О метрополитене" [About the metro] (in Russian). Moskovsky Metropoliten. Archived from the original on 29 November 2017. Retrieved 7 September 2017.
^Charbakh, Schwandl, Robert. "Yerevan". UrbanRail.Net. Retrieved 8 January 2013.
^История развития метрополитена [History of the metro]. Государственное предприятие『Минский Метрополитен』[State Enterprise "Minsk Metro"]. 2014. Retrieved 27 June 2015.
^ abМетро сегодня [Metro today] (in Russian). Государственное предприятие『Минский Метрополитен』[State Enterprise "Minsk Metro"]. 2014. Retrieved 27 June 2015.
^Gorkovskaya, Schwandl, Robert. "Nizhniy Novgorod". UrbanRail.Net. Retrieved 7 January 2013.
^Extension of Dzerzhinskaya Line, Schwandl, Robert. "Novosibirsk". UrbanRail.Net. Retrieved 8 January 2013.