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T-54/T-55 - ОБТ (СССР), модификации

T-54/T-55 - ...МОДИФИКАЦИИ

T-54
Type - Main battle tank
Place of origin - Soviet Union
Service history
In service - 1947-present
Production history
Designer - Morozov (T-54), OKB-520 (T-54A and later)
Designed - 1945
Manufacturer - KhPZ, UVZ (USSR), Bumar-Łabędy (Poland), ZTS Martin (Slovakia)
Produced - 1946-81 (USSR) / 1956-79 (Poland) / 1957-83 (Slovakia)
No. built - 96,000-100,000 est.

The T-54/T-55 tank series is the most widely used tank in the world and has seen service in over 50 countries. It has also served as the platform for a wide variety of specialty armored vehicles.
Current operators
 Abkhazia - A number of T-55s were in service at the beginning of the 1992-1993 War in Abkhazia. These were all lost in the first four months of the fighting, at which point Abkhazian forces had captured 8 T-55s from the Georgians. At peak strength, there were 100 T-55s and T-72s in service. More than 50 T-55s and T-72s were in service in 2004. 87 T-55s and T-72s were in service before the 2008 South Ossetia war. Between 50 and 60 T-55s and T-72s are currently in service.
 Afghanistan - 50 T-54s and 50 T-55s were ordered in 1961 from the Soviet Union and delivered between 1962 and 1964 (T-54s were previously in Soviet service). 200 T-54s were ordered in 1978 from the Soviet Union and delivered between 1978 and 1979 (the vehicles were previously in Soviet service). 705 T-55s were ordered in 1978 from the Soviet Union and delivered between 1978 and 1991 (the vehicles were previously in Soviet service). 1,000 T-54s, T-55s, T-62s and PT-76s were in service on 1 April 1992. Currently 600 T-55s are in service.
 Algeria - 40 T-54s were ordered in 1963 from the Soviet Union and delivered in 1963 (the vehicles were previously in Soviet service). 25 T-54s and 25 T-55s were ordered in 1965 from the Soviet Union and delivered in 1966 (T-54s were previously in Soviet service). 100 T-54s were ordered in 1966 from the Soviet Union and delivered between 1966 and 1967 (the vehicles were previously in Soviet service). 100 T-55s were ordered in 1966 from the Soviet Union and delivered in 1967. 50 T-55s were ordered in 1981 from the Soviet Union and delivered in 1982 (the vehicles were probably previously in Soviet service). 324 T-54s and T-55s were in service in early 2001 and 320 in early 2003 and 2004 and 270 in 2006.
 Angola - 150 T-54s and possibly T-55s were ordered in 1975 from the Soviet Union and delivered between 1975 and 1978 (the vehicles were previously in Soviet service). 100 T-55s were ordered in 1987 from the Soviet Union and delivered between 1987 and 1988 (the vehicles were probably previously in Soviet service). 30 T-55s were received between 1993 and 1994 from Russia (20 in 1993 and 10 in 1994). 62 T-55Ms were ordered in 1999 from Belarus and delivered in 1999 (the vehicles were previously in Soviet and later Belorussian service). 31 T-55s were ordered in 1999 from Bulgaria and delivered in 1999 (the vehicles were previously in Bulgarian service). 205 T-55AM2s were ordered in 1999 from Slovakia with 150 being delivered in 1999 and 55 in 2000 (the vehicles were previously in Czechoslovakian and later Slovakian service). 90 T-54s and T-55s were in service in 2000. Around 560 T-54s, T-55s, T-62s and T-72s were in service in early 2001. 400 T-54s and T-55s were in service in 2004 and around 200 in 2005 and 2006.
 Azerbaijan - used as an indirect-fire platform.
 Bosnia-Herzegovina - 10 T-55s were ordered in 1997 from Egypt and delivered in 1997 (the vehicles were previously in Egyptian service). 170 T-34s, T-55s, M60A3s and AMX-30s were in service in early 2001. 192 T-34s, T-54s T-55s, M60A3s, M-84s and AMX-30s were in service in early 2003. Currently, the military of Bosnia Herzegovina operates 180 T-55s. 80 T-55s were in service in 2004, 69 T-55s and 13 T-54s in 2005 and 75 T-55s in 2006.
 Cambodia - 10 T-54s were ordered in 1983 from the Soviet Union and delivered in 1983 (the vehicles were previously in Soviet service). 100 T-55s were ordered in 1988 from the Soviet Union and delivered in 1989 (aid, the vehicles were probably previously in Soviet service, the vehicles could be supplied by Vietnam). 15 T-55s were ordered in 1990 from the Soviet Union and delivered in 1990. 40 T-55AM2s were ordered in 1994 from Czech Republic and delivered in 1994 (the vehicles were previously in Czechoslovakian and later Czech service). 50 T-55AM2BPs were ordered in 1994 from Poland and delivered in 1994 (the vehicles were previously in Polish service). 150 T-55s, Type 59s and PT-76s were in service in early 2001 and 170 in early 2003. More than 100 T-54s and T-55s were in service in 2004 and 2006. 103 T-54s are currently in service 2007. Cambodia has purchased 50 T-55A main battle tank from eastern Europe that arrive on 20 September 2010. Cambodia's Armoured cavalry has 220 T-54/T-55 in service in 2011.
 Central African Republic - 4 T-55s were ordered in 1982 from Libya and delivered in 1982 (aid, the vehicles were probably previously in Libyan service). 4 T-55s were in service in early 2001 and 3 in early 2003, 2004 and 2006.
 Chad - 60 T-55s were in service in early 2001, early 2003, 2004 and 2006. Currently 60 T-55s are in service.
 Congo-Brazzaville - 25 T-54s and T-55s were ordered in 1982 from an unknown supplier and delivered in 1982 (the vehicles were probably second-hand). 25 T-54s and T-55s were in service in 2004 and 2006. Currently 25 T-54s and T-55s are in service.
 Congo-Kinshasa - 20 T-55s were ordered in 2005 from Ukraine and delivered in 2006 (the vehicles were previously in Soviet and later Ukrainian service). 20 T-55s were in service in 2006.
 Cuba - 100 T-55s were received in 1963 from the Soviet Union as aid (the vehicles were previously in Soviet service). 1,200 T-55s were ordered in 1964 from the Soviet Union and delivered between 1964 and 1975. 25 T-55s and T-54-based ARVs were ordered in 1981 from the Soviet Union and delivered in 1981 (the vehicles were previously in Soviet service). Currently Cuba possesses 1,100 T-55s, most of which are in storage or used as Artillery Propeller and SPAAG with SA-3 and SA-2 missiles mounted . 120 T-55s are modernized to T-55M standard and 20 more to T-55AM.
 Egypt - 350 T-54s were ordered in 1960 from the Soviet Union and delivered between 1961 and 1966 (the vehicles were probably from Czechoslovakian production line). 150 T-55s were ordered in 1963 from the Soviet Union and delivered between 1964 and 1966. Egypt lost 820 vehicles in the Six-Day War including 82 T-55s. 800 T-54s were ordered in 1967 from the Soviet Union and delivered between 1967 and 1972 (some of the vehicles were probably from Czechoslovakian and/or Poland production line). 550 T-55s were ordered in 1967 from the Soviet Union and delivered between 1969 and 1973. 50 T-54s were ordered in 1972 from the Soviet Union and delivered in 1973 (the vehicles were previously in Soviet service). 895 T-54s and T-55s were in service in early 2003 and 2004. 840 T-54s and T-55s were in storage in 2006. 260 Ramses IIs were in service in 2004 and 2006.
 Equatorial Guinea - Currently 3 T-55s are in service.
 Eritrea - 120 T-55As were ordered in 2004 from Bulgaria and delivered in 2005 (the vehicles were previously in Bulgarian service). 150 T-54s and T-55s were in service in early 2003, 2004 and 2006.
 Ethiopia - 200 T-54s and 200 T-55s were ordered in 1977 from the Soviet Union and delivered between 1977 and 1978 (the T-54s were previously in Soviet service while the T-55s were possibly previously in Soviet service). 60 T-54s were ordered in 1978 from East Germany and delivered between 1979 and 1980 (the vehicles were previously in East German service). 700 T-55s were ordered in 1980 from the Soviet Union and delivered between 1980 and 1988 (the vehicles were probably from Czechoslovakian production line). 90 T-55s were ordered in 1983 from Libya and delivered in 1984 (the vehicles were previously in Libyan service). 50 T-55s were ordered in 1989 from East Germany and delivered in 1989 (the vehicles were previously in East German service, more were ordered but the order was canceled). 40 T-55s were ordered in 1998 from Belarus and delivered in 1998 (the vehicles were previously in Belorussian service). 50 T-55s were ordered in 1998 from Bulgaria and delivered in 1999 (the vehicles were previously in Bulgarian service, some may have been ex-Ukrainian and/or ex-Romanian vehicles sold through Bulgaria). 140 T-55s were ordered in 1999 from Bulgaria and delivered between 1999 and 2002 (the vehicles were previously in Bulgarian service, some may have been ex-Ukrainian and/or ex-Romanian vehicles sold through Bulgaria, the delivery of last 40 vehicles was suspended between 2000 and 2001 due to UN embargo). Around 160 T-55s and T-62s were in service in early 2001 and more than 270 in early 2003. More than 250 T-54s, T-55s and T-62s were in service in 2004 and 2006.
Tigray Defense Forces
 Georgia - 120 T-55AM2s and T-54s were ordered in 1998 from Czech Republic with 10 T-55AM2s being delivered in 2000 and the rest in 2001 (the vehicles were previously in Czechoslovakian and later Czech service). 108 T-55Ms were in service at the beginning of the 1992-1993 War in Abkhazia. Around 40 T-55s were in service in 1992 and 1995, 48 in 2000, 59 in 2002, 55 in 2004, 2005 and 2006 and 56 in 2008.
 Guinea - 8 T-54s were ordered in 1974 from the Soviet Union and delivered in 1974 (the vehicles were probably second-hand). 8 T-54s were in service in 2004 and 2006. Currently 8 T-54s are in service.
 Hezbollah - Unknown number of Tiran 4 or 5 tanks and Ti-67 APCs captured from the South Lebanon Army in 2000, used in conjunction with ex-Syrian Army T-55s (aid, the vehicles were previously in Syrian service) in the ongoing Syrian Civil War.
 Iran - 60 T-54s and 65 T-55s were ordered in 1981 from Libya and delivered in 1981 (aid, the vehicles were previously in Libyan service). 120 T-55s were ordered in 1982 from Syria and delivered in 1982 (the vehicles were previously in Syrian service). Iran also bought a number of Tirans from Israel during the Iran-Iraq War. Some vehicles were captured from Iraq during the Iran-Iraq War. 100 T-54s and T-55s were in service in 1990, 110 in 1995, 500 in 2000 and around 250 in 2002. 540 T-54s, T-55s and Type 59s were in service in 2004, 2005, 2006 and 2008. 200 T-54s, T-55s and Type 59s have been upgraded to Safir-74 (also known as T-72Z although it should not be confused with Iraqi modernization of the same name) standard (20 could possibly be Sudanese vehicles modernized for Sudan).
 Iraq - 250 T-54s were ordered in 1958 from the Soviet Union and delivered between 1959 and 1965. 50 T-54s were ordered in 1967 from the Soviet Union and delivered in 1968. Between 80 and 120 T-54s were lost during the Yom Kippur War. 300 T-55s were ordered in 1973 from the Soviet Union and delivered between 1974 and 1975. 50 T-54s and T-55s were ordered in 1980 from East Germany and delivered in 1981 (the vehicles were previously in East German service). 400 T-55s and T-54s were ordered in 1980 from Poland and delivered between 1981 and 1982 (the vehicles were probably previously in Polish service). 250 T-55s were ordered in 1981 from Egypt and delivered between 1981 and 1983 (the vehicles were previously in Egyptian service). 150 TR-580s were ordered in 1981 from Romania and delivered between 1981 and 1984 (the vehicles were delivered via Egypt). 400 T-55s were ordered in 1981 from the Soviet Union and delivered between 1982 and 1985 (the vehicles were from the Czechoslovakian production line). Around 200 T-54s and T-55s were upgraded to T-72Z standard (not to be confused with Iranian T-54/55/Type 59 modernization Safir-74 also known as T-72Z). 1,500 T-54s, T-55s and TR-580s were in service with the Iraqi Regular Army in 1990 and 500 in 1995, 2000 and 2002. 406 T-54 and T-55 were in service with Iraqi Regular Army in 2003. All destroyed or scrapped except for 4 T-55s which are now in service with the New Iraqi Army. 76 T-55s are in service with New Iraqi Army since 2004. 4 VT-55As were ordered in 2005 from Hungary and delivered in 2005 (aid, the vehicles were previously in Hungarian service). Iraq also received 2 JVBT-55As in 2005 from Hungary.
 Ivory Coast - 10 T-55s were in service in early 2003, 2004 and 2006.
 Kurdistan - 250-300 T-54s, T-55s and Type-59s captured from former Iraqi army. Not all are operational. 95 in active service as of 2011, and 120 in reserve. The fate of the rest of the captured tanks is unknown.
Kurdish People's Defense Units (YPG) - operated 12 T-55s that came from Syrian Army stocks or were captured from the ISIS in the ongoing Syrian Civil War.
 Laos - 15 T-54s and 15 T-55s were ordered in 1973 from the Soviet Union and delivered in 1975 (aid, the vehicles were probably previously in Soviet service). 15 T-54s and T-55s were in service in 2004 and 2006. T-54s and T-55s were paraded as recently as January 2019.
 Lebanon - 180 T-54s and T-55s were ordered in 1991 from Syria and delivered between 1992 and 1993 (aid, the vehicles were previously in Syrian service).
 Libya - 100 T-54s and 100 T-55s were ordered in 1970 from the Soviet Union and delivered between 1970 and 1971 (the T-54s were probably previously in Soviet service). 150 T-55s were ordered in 1973 from the Soviet Union and delivered in 1974. 500 T-54s were ordered in 1975 from the Soviet Union and delivered in 1976 (the vehicles were previously in Soviet service). 200 T-54s were ordered in 1976 from the Soviet Union and delivered between 1976 and 1977 (the vehicles were previously in Soviet service). 2,000 T-55s were ordered in 1976 from the Soviet Union and delivered between 1977 and 1978. Around 2,200 T-55s were in service in 1986. 1,600 T-54s and T-55s were in service and in storage in early 2001, 500 in service in early 2003, 500 in service and around 1,040 in storage in 2004 and 2006. 210 T-54s and T-55s are currently in service.
 Mali - 21 T-34s, T-54s and T-55s were in service in early 2001, 33 in early 2003. 12 T-54s and T-55s were in service in 2004, 2006 and 2013 but with old or broken radios.
 Mauritania - 35 T-55s were ordered in 1990 from Soviet Union and delivered in 1991 (the vehicles were second-hand). 16 T-55s were ordered in 2001 from Poland and delivered in 2002 (the vehicles were previously in Polish service). 35 T-55s were in service in early 2001, early 2003, 2004 and 2006. Currently 35 T-55s are in service.
 Mongolia - 250 T-54s were ordered in 1960 from the Soviet Union and delivered between 1961 and 1964. 250 T-55s were ordered in 1963 from the Soviet Union and delivered between 1964 and 1967. 650 T-54s, T-55s and T-62s were in service in early 2001 and 370 in early 2003. 370 T-54s and T-55s were in service in 2004 and 2006. Currently 370 T-54s and T-55s are in service.
 Mozambique - 60 T-54s were ordered in 1981 from the Soviet Union and delivered in 1982 (the vehicles were previously in Soviet service). 50 T-55s were ordered in 1982 from the Soviet Union and delivered in 1983 (the vehicles were previously in Soviet service). 60 T-55s were ordered in 1982 from the Soviet Union and delivered between 1983 and 1985 (the vehicles were previously in Soviet service). Around 60 T-54s were in service in 2005 and more than 60 in 2006.
 Myanmar - 10 T-55s Delivered from India.
 Namibia - Up to 20 T-34s and T-55s were in service in early 2001 and a few in early 2003. Some T-34s, T-54s and T-55s in service in 2004 and 2006.
 Nicaragua - 20 T-55s were ordered in 1981 from an unknown supplier and delivered in 1981 (the vehicles were possibly previously in Libyan service). 66 T-55s were ordered in 1984 from the Soviet Union and delivered in 1984 (the vehicles were previously in Soviet service). 20 T-54s were ordered in 1984 from the Soviet Union and delivered in 1985 (the vehicles were previously in Soviet service). 50 T-55s were ordered in 1986 from the Soviet Union and delivered in 1987 (the vehicles were previously in Soviet service). 127 T-55s were in service and in storage in early 2001 and early 2003 and 62 in service and 65 in storage in 2004 and 2006. Currently 31 T-55s are in service.
 Nigeria - Between 50 and 100 T-55s were ordered in 1979 from the Soviet Union and delivered in 1981 (the vehicles were probably previously in Soviet service). Around 200 T-55s and Vickers Mk. IIIs were in service in early 2001 and around 250 in early 2003. 100 T-55s were in service in 2004 and 2006. Currently 50 T-55s are in service and are 50% serviceable.
 North Korea - 400 T-54s and 250 T-55s were ordered in 1966 from the Soviet Union and delivered between 1967 and 1970. 300 T-54s were ordered in 1967 from the Soviet Union and delivered between 1969 and 1974 (the vehicles were probably produced or assembled in North Korea). 50 T-55s were ordered in 1970 from the Soviet Union and delivered between 1972 and 1973. 500 T-55s were ordered in 1973 from the Soviet Union and delivered between 1975 and 1979 (The supplier may have been PRC in which case the vehicles wouldn't be T-55s but Type 59s). 19 T-55s were ordered from Russia and delivered in 1992 (the vehicles were delivered through Belarus). There were 1,600 T-54s in service in 1985, 1990, 1995 and 2000. There were 3,500 T-34s, T-54s, T-55s, T-62s and Type 59s in early 2001 through 2004, and more than 3,500 in 2006.
 "Novorossiya" - 1 T-54 was acquired from an open-air museum in July 2014, with hopes of restoring the tank to combat-ready status. It is unknown if the tank is currently operational.
 Pakistan - 100 T-54s were ordered in 1968 from the Soviet Union and delivered in 1969 (the vehicles were previously in Soviet service). 100 T-55s were ordered in 1968 from the Soviet Union and delivered in 1968. As of 2010, 54 T-54/55 tanks in Reserve. 282 tanks T-55H ordered from Serbia and first batch of 100 tanks where delivered to Pakistan in April 2020 (the vehicles were previously in Serbian service).
 Peru - 24 T-54s were ordered in 1973 from the Soviet Union and delivered in 1973. 250 T-55s were ordered in 1973 from the Soviet Union and delivered between 1974 and 1975. At peak there were 375 T-54s and T-55s in service. 300 T-54s and T-55s were in service in early 2001 and 275 (around 200 were serviceable in 2005 and 2006) in service in early 2003, 2004 and 2006. 300 T-54s and T-55s as well as an unknown amount of T-54/55-based ARVes are currently in service.
Western Sahara Polisario Front - around 70 T-55As.
 Romania - 120 TR-580s were in service with the Romanian Naval Infantry in early 2001 and early 2003. 850 T-55s were ordered in 1969 from the Soviet Union and delivered between 1970 and 1977. 400 TR-580s ordered in 1975 and produced between 1977 and 1981. 150 TR-580s were produced for Iraq. Romania also acquired a number of T-54s which are now in reserve. 398 TR-580s were in service with the Romanian Army in 1993, around 88 TR-580s in early 1999, 717 T-55s and 227 TR-580s in early 2003 and 2004, and 268 T-55s and 43 TR-580s in 2006. According to the UN register of conventional arms, Romanian Armed Forces operated 710 T-55s and 227 TR-580s in 2006, 750 T-55s and 226 TR-580s in 2007, and 394 T-55s and 227 TR-580s in 2017.
 Rwanda - 12 T-54s and T-55s were in service in early 2001, 30 in early 2003, 24 in 2005 and 2006. At least 10 Ti-67s in service.
 Serbia - Unknown number of JVBT armoured recovery vehicles operational in the Serbian Armed Forces.
 Slovenia - 30 M-55S-1s are currently in service and are in the process of being withdrawn. 46 T-55s (14 were in storage) and 12 M-55Ss and M-55S-1s were in service in 1998. Overall 30 T-55s were modernized to the M-55S/M-55S-1 standard.
 Sri Lanka - 25 T-55As were ordered from Czechoslovakia and delivered in 1991 along with several T 55 ARVs which saw acting in its Civil War. In 2000, 40 T-55AM2s were ordered from the Czech Republic.
 Somalia - 100 T-54s were ordered in 1972 from the Soviet Union and delivered between 1973 and 1974. 50 T-55s were ordered in 1973 from the Soviet Union and delivered in 1975 (the vehicles were previously in Soviet service). 35 T-54s were ordered in 1977 from Egypt and delivered in 1977 (the vehicles were previously in Egyptian service).
 Somaliland - 85.
 South Ossetia - At peak there were 12 T-55s and 75 T-72s in service. 15 T-55s and T-72s were in service before the 2008 South Ossetia war. All T-55 in reserve since 2011.
 South Sudan - Some captured T-54s and T-55s.
 Sudan - 50 T-54s and 50 T-55s were ordered in 1969 from the Soviet Union and delivered between 1969 and 1970. 9 T-55s were ordered in 1996 from Belarus and delivered in 1996 (the vehicles were previously in Soviet and later Belorussian service). 20 T-55AM2BPs were ordered in 1998 from Poland and delivered in 1999 (these were the first batch of 50 originally sold to Yemen where it was illegally diverted to Sudan after which the delivery of the remaining 30 was put on hold, the vehicles were previously in Polish service). 60 T-55Ms were ordered in 1999 from Belarus with 40 being delivered in 1999 and 20 in 2001 (the vehicles were previously in Soviet and later Belorussian service). 20 T-72Zs ordered in 2005 from Iran and delivered in 2006 (these could possibly be Sudanese T-54s, T-55s or Type 59s modernized to the T-72Z standard). 170 T-55s and Type 59s were in service in early 2001, 200 in early 2003. 200 T-54s and T-55s in service in 2004 and 2006.
 Syria - 150 T-54s were ordered in 1956 from the Soviet Union and delivered between 1957 and 1958. 300 T-54s were ordered in 1967 from the Soviet Union and delivered between 1967 and 1972 (the vehicles were previously in Soviet service). 75 T-55s were ordered in 1967 from the Soviet Union and delivered between 1967 and 1968. 300 T-55s were ordered in 1968 from the Soviet Union and delivered between 1969 and 1972. 400 T-54s and 400 T-55s were ordered in 1973 from the Soviet Union and delivered between 1973 and 1978 (T-54s and probably T-55s were previously in Soviet service). 600 T-55s were ordered in 1978 from the Soviet Union and delivered between 1979 and 1981. 2,050 T-54s and T-55s were in service and in storage in 1990, 2,100 in 1995, 2,150 in 2000, 2,000 in 2001, 2003 and around 2,000 in 2005.
 Tanzania - 32 T-54s were ordered in 1979 from East Germany and delivered between 1979 and 1980 (the vehicles were probably previously in East German service). 65 T-54s and Type 59s were in service in early 2001 and 45 in early 2003. 30 T-54s were in service in 2004 and 2006.
 Togo - 2 T-54s and 2 T-55s were ordered in 1982 from Egypt and delivered in 1982 (the vehicles were second-hand). 1 T-54 and 1 T-55 were in service in early 2001, early 2003, 2004 and 2006.
 Uganda - 16 T-54s were ordered in 1974 from the Soviet Union and delivered in 1975 (the vehicles were probably previously in Soviet service). 60 T-55s were ordered in 1994 from Ukraine and delivered in 1995 (the vehicles were previously in Soviet and later Ukrainian service). 62 T-55s were ordered in 1998 from Ukraine and delivered in 1998 (the vehicles were previously in Soviet and later Ukrainian service). 28 T-55s were ordered in 1998 from Bulgaria and delivered in 1998 (the vehicles were previously in Bulgarian service, part of a $35 m deal for 90 vehicles including some bought by Bulgaria from Ukraine and possibly Romania for export to Uganda). 10 T-55Ms were ordered in 2000 from Belarus and delivered in 2000 (the vehicles were previously in Soviet and later Belorussian service). 140 T-54s and T-55s and PT-76s were in service in early 2001. 180 T-54s and T-55s were in service in early 2003, 152 in 2005 and 2006.
 Ukraine - At least 700 T-54s and T-55s were originally inherited from the Soviet Union. 680 T-54s and T-55s were in service in 1995 and 149 in 2000. In 2004, 2005, 2006 and 2010 there were 112 T-55s in service. There is also an unknown number of IMRs and MTP-3s in service. In October 2022 28 M55-S donated from Slovenia.
 Uruguay - 15 Tiran-4Shes and Tiran-5Shes were ordered from Israel in 1997 and delivered the same year (the vehicles were previously in Israeli service). 15 Tiran-4Shes and Tiran-5Shs were in service in early 2001, early 2003, 2004 and 2006.
 Uzbekistan - 80.
 Vietnam - 1,939 T-34s, T-54s, T-55s, T-62s, PT-76s and Type 59s were in service in early 2001. 850 T-54s and T-55s and 350 Type-59 were in service in early 2003, 2004 and 2006.
 Yemen - 6 T-55s were received from Bulgaria in 1994. 97 T-55s and 35 T-55AM2s were ordered in 1999 from Czech Republic with T-55s delivered in 2000 and T-55AM2s in 2002 (the vehicles were previously in Czechoslovakian and later Czech service and were possibly modernized prior to being delivered). 990 T-34s, T-54s, T-55s, T-62s and M60s were in service in early 2001. 450 T-54s and T-55s were in service in early 2003, 2004 and 2006.
 Zambia - 5 T-54s were ordered in 1975 from the Soviet Union and delivered in 1976. 20 T-55s were ordered in 1980 from the Soviet Union and delivered in 1981 (part of a $72-100M deal). 60 T-55s, PT-76s and Type 59s were in service in early 2001 and early 2003. 10 T-55s were in service in 2004 and 2006.
 Zimbabwe - 20 T-54 tanks received from USSR in September 1984.
Former operators
 Albania - 75 T-54s and 300 T-55s operated by Albania at one time along with 750 Chinese Type 59's, today all have been phased out of service.
ShababFlag.svg Al Qaeda in the Arabian Peninsula - operated small numbers of T-55's captured from Yemeni stocks.
Flag of the Amal Movement.svg Amal Movement - 50 T-55As were ordered in 1985-86 from Syria and delivered in 1985-86 (aid, the vehicles were previously in Syrian service). All served with the Amal Movement's regular forces until the end of the Lebanese Civil War in 1990-91 and passed on to the Lebanese Armed Forces or the Syrian Army.
 Bangladesh - 30 T-54s were ordered in 1975 from Egypt and delivered in 1975 (as aid, the vehicles were previously in Egyptian service). 100 T-54s and T-55s were in service in 2004 and 2006.
 Belarus
 Bulgaria - 900 T-54s were ordered in 1953 from the Soviet Union and delivered between 1954 and 1959. 900 T-55s were ordered in 1961 from the Soviet Union and delivered between 1962 and 1970. 1,475 T-54s, T-55s and T-72s were in service in early 2001. 1,042 T-54s and T-55s were in service in early 2003, 2004 and 2006. Currently, up to 430 are in reserve status. Some are used for basic tank driver training.
 Croatia - The majority of the Croatian T-55s were captured from the Yugoslav army forces. Around 209 T-55s were in service in 1998 and 222 in 2003, 2004 and 2006.
 Chile - At least four captured Egyptian T-54s and T-55s were ordered in 1978 from Israel and delivered in 1979, in order to train Chilean crews to operate captured Peruvian T-55s.
 Czech Republic - At least 296 T-54s and T-55s, 2 MT-55s, 25 VT-55s were inherited from Czechoslovakia. 792 T-55s and T-72s were in service in early 2001. According to the UN register of conventional arms, Czech Armed Forces operated 948 T-55s and T-72s in 1997, 938 in 1998, 792 in 1999 and 652 as of 1 January 2001. Last vehicles were withdrawn from service in early years of the 2000s (decade).
 Czechoslovakia - 1,800 T-54s were ordered in 1957 and produced under license between 1958 and 1963. 1,700 T-55s were ordered in 1963 and produced under license between 1964 and 1973. Overall 2,700 T-54s were produced under license between 1957 and 1966 and 8,300 T-55s and T-55As between 1964 and 1983 (T-55A was probably produced since 1968) (most for export). Passed on to successor states.
 Ecuador - 3 T-55s were in service in early 2001, 30 in early 2003, more than 30 in 2004 (possibly non in operational service as of 2005) and more than 30 in storage in 2006.
 Finland - 50 T-54s were ordered in 1960 from the Soviet Union and delivered between 1960 and 1961. 70 T-55s were ordered in 1965 from the Soviet Union and delivered between 1965 and 1967. An additional 10 T-55AMs were bought from Poland and converted into T-55AM-Marksman SPAAGs (the turrets were delivered in two batches, the first one was ordered in 1988 and delivered between 1990 and 1991 and the second one was ordered in 1992 and delivered in 1993). 230 T-55s and T-72s were in service in early 2001. 74 T-55s were in service in early 2003. 33 T-54s and 74 T-55Ms were in storage in 2004 and 74 T-55Ms in 2005. 56 T-55 turrets were purchased from the Soviet Union in the late 1960s and emplaced in coastal fortifications as 100 56 TK light coastal guns. The last of these were deactivated in 2012.
 Germany - taken from GDR's army, all scrapped, sold to other countries or given to museums.
 East Germany - 202 T-54s were ordered in 1956 from the Soviet Union and delivered between 1956 and 1957. 488 T-54As and T-54AMs were ordered from Poland and delivered between 1959 and 1964. 1766 T-55s and T-55As were ordered in 1964 from Czechoslovakia and delivered between 1964 and 1980. 333 T-55s and T-55A(P)s were ordered from Poland and delivered between 1965 and 1973. 362 VT-55s were ordered in 1964 from Czechoslovakia and delivered between 1965 and 1969. Passed on to the unified German state.
 Hungary
 India - 300 T-54s were ordered in 1964 from the Soviet Union and delivered between 1965 and 1967. 225 T-55s were ordered in 1968 from the Soviet Union and delivered between 1968 and 1971. 650 T-55s were ordered in 1971 from the Soviet Union and delivered between 1971 and 1974. 274 T-54s, 44 T-55s and 7 T-55AKs were ordered in 1970 from Czechoslovakia and delivered between 1970 and 1971 (some of the vehicles were previously in Czechoslovakian service). 300 T-55s were ordered in 1971 from Poland and delivered in 1971 (some of the vehicles were previously in Polish service). 800 T-55s and modernized T-55s were in service in 1990, around 750 in 1995, around 700 in 2000, early 2001 and early 2003, 450 in 2002, 2005 and 2008. The number of T-55s and modernized T-55s in service is to stay at 450 in 2010 and to be reduced to 220 by 2015. There were around 550 T-55s in active service and around 200 in storage in 1999. In 2004, the Indian Army had a total of 700 T-55s, 450 of which were in operational service. In 2006, the Indian Army Had 715 T-55s, modernized with night-fighting equipment and new fire control systems, around 67 of them were in reserve. In May 2011, the last T-55s were retired from active service and moved to reserve storage.
 Islamic State of Iraq and the Levant - operated small numbers captured from Syrian and possibly Iraqi stocks.
 Israel - The Israeli army captured during the Six-Day War, repaired, modernized and put into service around 200 T-54s, T-55s and PT-76s. T-54s and T-55s were modernized to Tiran 4 or 5 standard prior to the Yom Kippur War. During that conflict, Israel captured additional T-54s and T-55s. Tirans were withdrawn from active service at the end of the 1980s. Some were sold and some were converted into Achzarit APCs. However, some Tirans are still in possession of the Israeli Army, possibly in reserve or in storage. The Israeli Army had 1,500 T-54s and T-55s in 1990, 300 in 1995, 200 in early 2001 and early 2003 and 114 in 2004, 126 T-54s, T-55s and Tiran 6s in 2006 and 2008 and 488 Tirans in 1990, 300 in 1995, 200 in 2000, 2001 and 2002 and 261 in 2006 and 2008. The Achzarits are in service with the Israeli Army since at least 1995. There were 270 Achzarits in service in 2004, 276 in 2006 and 2008.
 Lebanese Forces: 40 Ti-67 Tirans (Israeli-modified T-54/55s) were supplied by Israel after 1980, another 20 T-54/55s were captured from the Syrian Army in summer 1982 and 64 more were supplied by Iraq between 1986 and 1989 (aid, the vehicles were previously in Iraqi service). A few VT-55KS Armoured Recovery Vehicles were also captured from the Syrian Army. All served with the Lebanese Forces until the end of the Lebanese Civil War in 1991-94. Passed on to the Lebanese Armed Forces and the Syrian Army or returned to Israel.
 Latvia - 5 T-55AMs Mérida were donated by Poland in 1999. 3 T-55AMs were in service in early 2001, early 2003, 2004 and 2006. The last T-55AM2s are in service.
 Montenegro - 61 T-55s Scrapped.
 Morocco - 40 T-54Bs were ordered in 1960 from the Soviet Union and delivered in 1962. 80 T-54s were ordered in 1966 from the Soviet Union and delivered between 1967 and 1968 (the vehicles were probably from Czechoslovakian production line) mostly lost in wars (Western Sahara war) or scrapped due to lack of spare parts.
 North Macedonia - Between 58 and 114 T-55s were ordered in 1999 from Bulgaria and delivered in 1999 (aid, the vehicles were previously in Bulgarian service, up to 56 of the vehicles were bought for spares). 36 T-55AM-2s were ordered in 1999 and delivered in 1999 (aid, the vehicles were previously in Bulgarian service). 94 T-55s were in service in early 2001, 125 T-55s and T-72s in early 2003, 30 T-55As in 2004 and 2006.
 North Vietnam - 400 T-54s were ordered in 1969 from the Soviet Union and delivered between 1970 and 1972 (aid). 600 T-55s were ordered in 1973 from the Soviet Union and delivered between 1973 and 1975 (aid). Passed on to the successor state.
 Palestine Liberation Organization (PLO) - 20 T-54/55s operated by the Palestinian guerrilla factions during the 1982 Lebanon War. All but 4 were either captured or destroyed by the Israelis.
 People's Liberation Army (Lebanon) - 4 T-55As provided on loan by the DPFLP and Fatah in 1983 (aid, the vehicles were previously in DPFLP service). 70 T-55As were ordered in 1986-87 from Syria and Libya and delivered in 1986-87 (aid, the vehicles were previously in Syrian and Libyan service), along with a number of BTS-4 and VT-55KS Armoured Recovery Vehicles (ARV). All served with the PLA until the end of the Lebanese Civil War in 1990-91 and passed on to the Lebanese Armed Forces or the Syrian Army.
 Poland - 3,000 T-54, T-54A, T-54AD and T-54AM produced between 1956 and 1964. 7,000 T-55, T-55L, T-55AD-1 and T-55AD-2 produced between 1964 and 1979. Some T-54A upgraded to T-55 standard. 200 T-54 tanks have been upgraded to T-55LD in 1975, 10 of which were later sold to Libya. In 1980 Ludowe Wojsko Polskie (LWP) operated 1,207 T-55L, T-55LD, T-55AD-1 and T-55AD-2, 146 T-55, 986 T-55U and 340 T-54, T-54A, T-54AD and T-54AM. Eventually almost all T-54 and T-55 tanks have been upgraded to T-55AM "Merida" standard (there are some not upgraded ones in the museums). Last 839 were withdrawn from service in 2002. All Polish T-54 and T-55 that were withdrawn from service were either used as shooting targets at proving grounds, sold to other countries or given to museums.
 Republika Srpska - 72 T-55s were in service and in storage in 2005. Passed on to the Armed Forces of Bosnia and Herzegovina.
 Rhodesia - 8 T-55LD tanks given by the Republic of South Africa after being seized on a ship en route for Uganda, together with SADF advisers for the purpose of training the Rhodesian crews. The tanks were assigned to purpose-created E Squadron of the Rhodesian Armoured Corps. It is unknown whether these tanks were passed on to the successor state or destroyed during the Rhodesian Bush War.
 Russia - At least 3,000 inherited from the Soviet Union. 412 T-54s and T-55s were in active service in 1995 and 20 in 2000. 1,200 T-54s and T-55s were in storage in 2000, 2005 and 2008. As of 2013 there are 100 T-55s in reserve and less than 500 in storage, however those in storage may have been scrapped already.
 Slovakia - At least 206 were inherited from Czechoslovakia. 1 T-55AM2B received from Czech Republic in 2000. 1 T-55AM2 received from Czech Republic in 2001. 2 T-55AM2s received from Czech Republic in 2005. 275 T-55s and T-72s were in service in 1999. 3 T-55s were in service in early 2001.
South Lebanon Army - 60 Ti-67 Tiran 4 and Tiran 5s (Israeli-modified T-54/55s) were supplied by Israel after 1982 (aid, the vehicles were previously in Israeli service), with a few being converted in 1987 into Armoured Personnel Carriers. Captured by Hezbollah or the Amal Movement and passed on to the Lebanese Armed Forces in 2000.
 Soviet Union - 35,000 T-54-1 (T-54 Model 1946), T-54-2 (T-54 Model 1949), T-54 (T-54-3 or T-54 Model 1951), T-54A, T-54B, T-54AK1, T-54AK2, T-54BK1 and T-54BK2. produced between 1946 and 1958. 27,500 T-55, T-55A, T-55K1, T-55K2, T-55K3, T-55AK1, T-55AK2 and T-55AK3 produced between 1955 and 1981. Passed on to successor states.
 Sweden - 34 T-55 BLG-60M2 Bridge Layers were ordered in 1994 from Germany, originally inherited from East Germany. The Swedish designation was Brobv 971 (Brobandvagn 971 or Tracked bridge vehicle 971). The bridge layers were in service from 1997 until 2011 when they were replaced by a model based on the Leopard 2.
 Yugoslavia -160 T-54s and 1600 T-55s in service in 1991. Passed on to successor states.
Evaluation-only operators
 South Africa - 10 Polish-built T-55LD tanks (part of a batch of 200 T-54s rebuilt in 1975) seized from a French ship, the Astor, which had been transporting a heavy weapons consignment from Libya for Idi Amin in Uganda. Amin's regime collapsed on the day that the ship docked in Mombasa, and it was redirected to Angola. The ship called in to Durban where the cargo was seized. Two T-55LD tanks have been kept by the South Africans for evaluation while eight were given to Rhodesia, together with SADF advisers for the purpose of training Rhodesian crews. The rumour was spread that the tanks had been captured in Mozambique in order to obscure South Africa's part in the deal.

Models

T-54
T-54-1 (Ob'yekt 137) or T-54 Model 1946 Produced 1946-1948. With a streamlined turret and wide gun mantlet, similar to T-44, new V-54 engine, unstabilized D-10T 100 mm main gun, and two SG-43 machine guns in bins on the fenders. Only a small number was built for trials that were a fiasco; as a result, the production of the T-54 series was halted until the implementation of modifications.
T-54-2 (Ob'yekt 137R) or T-54 Model 1949 - Produced 1949-1952. It incorporated a number of improvements to the turret, as well a wider track (580 mm) and modernized transmission. The turret is dome-shaped with flat sides (inspired by the IS-3 heavy tanks), similar to later T-54s but with a distinctive overhang at the rear. The hull machine gun replaced the fender bin mounted ones. It also had a shorter bustle.
T-54-3 (Ob'yekt 137Sh) or T-54 Model 1951 - Produced 1952-1954, in Poland 1956-1964. Adopted the familiar, fully egg-shaped turret and new TSh-2-22 telescopic gunner's sight instead of the TSh-20. Also, early T-54's lacked a snorkel. The tank is also able to use its engine exhaust smoke system to create smokescreen by injecting vaporized diesel fuel onto the exhaust system. This feature was continued throughout the entire T-54/T-55 series and was used in the T-62 series.
T-54A (Ob'yekt 137G) - Produced 1955-1957, in Poland 1956-1964, in Czechoslovakia 1957-1966, and in China as the Type 59. Added STP-1 "Gorizont" vertical-plane gun stabilizer to D-10T tank gun and this new weapon was designated D-10TG. Originally had a small muzzle counter-weight, which was later replaced with a fume extractor. Also introduced were the OPVT wading snorkel, the TSh-2A-22 telescopic sight, the TVN-1 infrared driver's periscope and IR headlight, the new R-113 radio, a multi-stage engine air filter and radiator controls for improved engine performance, an electrical oil pump, bilge pump, automatic fire extinguisher and extra fuel tanks.
T-54B (Ob'yekt 137G2) - Produced from 1957 to 1958. It is armed with the D-10T2S tank gun with STP-2 "Tsyklon" 2-plane stabilization. From 1959, infrared night-fighting equipment was added: L-2 "Luna" infrared searchlight, TPN-1-22-11 IR gunner's day-and-night sight, OU-3 IR commander's searchlight. NATO code: T-54(M).
T-54K1, T-54K2, T-54AK1, T-54AK2, T-54BK1, T-54BK2, T-54MK1, T-54MK2 were command tanks corresponding to the main production models, with extra communications equipment at the expense of 5 tank rounds. K1 version had a second R-113 (or R-123) radio for company commanders, K2 version had 10 m semi-telescoping antenna mast, for battalion and regimental commanders, and regimental chiefs-of-staff. They were also equipped with the TNA-2 navigational system and AB-1-P/30 reloading device.
T-55
T-55 (Ob'yekt 155) - Produced 1958-1963, in Poland 1958-1964, in Czechoslovakia from 1958 to 1983. It has a new turret with floor, PAZ nuclear-blast protection and over-pressure NBC system, gamma ray detector, improved V-55 engine developing 580 horsepower (430 kW) (the engine output was boosted by increasing both pressure of injected fuel and degree of compression) and power-assisted clutch, MC-1 internal oil filter, AK-150S compressor which allows pneumatic start of the engine (the electric starter was removed), new internal fuel tanks with a capacity of 300 L situated in the front of the hull (this increased the overall capacity of the internal fuel tanks to 680 L), ammunition load for the main gun was increased from 34 rounds to 43 (18 of which are stored in "wet containers" situated inside the hull fuel tanks), "Rosa" fire-protection system and TDA exhaust smoke generator. The engine compartment was equipped with a heating system. To compensate for the increase in mass caused by the new equipment the rear hull armour was thinned. The loader's DShK 1938/46 antiaircraft heavy machine gun was removed. The T-55 also lacks a turret dome ventilator. Early units had flush loader's hatch. "Starfish" road wheels replaced earlier "spider" style. Also a snorkel can be placed on T-55 (unlike its predecessors) to allow it to cross 5.5 m depths at a speed of 2 kilometres per hour (1.2 mph) (without preparation T-55 can cross 1.4 m depths). This equipment takes about 30 minutes' preparation, but can be jettisoned immediately on leaving the water.
T-55A (Ob'yekt 155A) - Produced 1963-1981, in Poland 1964-1979. The T-55A MBT was primarily developed to incorporate a new antiradiation lining and full PAZ/FVU chemical filtration system. One of the major internal additions was the use of a plasticized lead sheeting for antiradiation protection. This was evident externally due to use of an enlarged driver's hatch and enlarged combings over the commander's and loader's hatch to accommodate the new material. Improved POV anti-radiation protection (leading to visibly protruding turret hatches) and NBC filtration, dispensed with bow machine gun. The coaxial SGMT machine gun was replaced with a PKT machine gun. The hull machine gun was removed, which made room for six more 100 mm gun rounds Since 1970, T-55A tanks began to receive a new turret fitting for the 12.7 mm DShK 1938/46 antiaircraft heavy machine gun.
T-55K1 (Ob'yekt 155K1), T-55K2 (Ob'yekt 155K2), T-55K3 (Ob'yekt 155K3), T-55AK1 (Ob'yekt 155AK1), T-55AK2 (Ob'yekt 155AK2), T-55AK3 (Ob'yekt 155AK3), T-55MK1 (Ob'yekt 155MK1), T-55MK2 (Ob'yekt 155MK2), T-55MK3 (Ob'yekt 155MK3) - Command tanks, fitted with additional radio sets. Sub-versions are the K1 and K2 models with two R-123 (or R-123M) and used at company and battalion level respectively. They carry five fewer rounds for the main gun than the standard tanks. The regiment commander's K3 is equipped with an R-130M, an R-123M, a 10-metre antenna mast and an AB-1-P/30 generator at the expense of twelve 100 mm rounds. Early models had the R-113 and R-112 sets instead of the R-123 and R-130, the upgraded M series is fitted with R-173 and R-143T2 sets respectively.

Modernization

T-54
T-54-2 fitted with the ZET-1 vehicle protection system. It has net structure centered on vehicles main armament and flipper-type side plates.
T-54M (Ob'yekt 137M) (mid-1960s) - Upgrade program to bring T-54s up to T-55 standard.
T-54M (Ob'yekt 137M) (1977) - Additional upgrades, including OPVT snorkel and KTD-1 laser rangefinder.
T-54AM (Ob'yekt 137M) (mid-1960s) - Further upgrades, including increased ammunition, new radios, new V-55 engine. Some received new RMSh track and drive sprocket developed for the T-72 tank in the late 1970s and early 1980s. Similar programs were carried out in other countries (T-54Z, T-54AZ, T-54AMZ for Zusatzausrüstung, 'additional equipment' in East Germany, T-54AR Řeka/Reka, 'river', with fording snorkel in Czechoslovakia).
T-55
Early on during the production T-55s were fitted with the TSh-2B-32P sight. Starting in 1970 T-55s were being armed at Uralwagonzavod with either a 12.7 mm DShK 1938/46 or KPVT loader's anti-aircraft heavy machine guns. These tanks were known as Model 1970, or sometimes T-55AM. KTD-1 or KTD-2 laser rangefinders and R-123 or R-123M radio sets were fitted to older tanks starting in 1974 (Model 1974). At the same time efforts were made to modernize and prolong the life of the drive train.
T-55 fitted with the ZET-1 vehicle protection system. It has net structure centred on vehicles main armament and flipper-type side plates.
T-55M (Ob'yekt 155M)/T-55AM (Ob'yekt 155AM) - Modernization of respectively T-55 and T-55A with new "Volna" fire control system, 9K116-1 "Bastion" ATGM system with new 1K13 BOM guidance device/sight, improved "Tsiklon-M1" gun stabilization system and TShSM-32PV sights, V-55U engine, improved suspension and RMSh tracks, increased armour, anti-mine, anti-napalm and improved anti-radiation protection and new R-173/173P radio set. Visual differences include a laser range-finder in an armoured box fitted over the main armament, side skirts, 81 mm "Tucha" smoke grenade launchers, BDD turret brow armour and glacis appliqué, and rear RPG screens (only used rarely in Afghanistan).
T-55M-1 (Ob'yekt 155M-1)/T-55AM-1 (Ob'yekt 155AM-1) - The "-1" suffix was applied to later modified tanks that are powered by the 691 hp (515 kW) V-46-5M engine, which was derived from the T-72's 780 hp (582 kW) V-46-6.
T-55AD "Drozd" (Ob'yekt 155AD) - T-55A fitted with Drozd ('thrush') active protection system (KAZ - kompleks aktivnoj zashchity). Soviet Naval Infantry saved money by installing "Drozd" on a small number of tanks instead of opting for appliqué armour, or acquiring newer T-72s. About 250 were kept in stores for secrecy, but later switched to simpler reactive armour. T-55AD is also fitted with the radio set R-173, sight TShSM-32PV, "Tsiklon-M1" stabilizer etc. of the T-55AM.
T-55AD-1 (Ob'yekt 155AD-1) - Version powered by the 691 hp (515 kW) V-46-5M engine, which was derived from the T-72's 780 hp (582 kW) V-46-6.
T-55MV (Ob'yekt 155MV)/T-55AMV (Ob'yekt 155AMV) - "V" for vzryvnoj ('explosive') designated tanks, which carried "Kontakt-1" explosive reactive armour (ERA) instead of the passive BDD armour. The ERA bricks (EDZ or elementi dinamicheskoj zashchity) are normally mounted on the turret front, hull front and the hull sides. This variant was adopted by Soviet Naval Infantry first, and by the Russian Army after the collapse of the Soviet Union. The T-55MV is a modernized T-55M and the T-55AMV is a modernized T-55AM.
T-55MV-1 (Ob'yekt 155MV-1)/T-55AMV-1 (Ob'yekt 155AMV-1) - Versions powered by the 691 hp (515 kW) engine V-46-5M.
T-55M5 (Ob'yekt 155M5) - This modernization kit adds convex explosive reactive armour "Kontakt-5" panels around turret front, armour panel on glacis plate, a longer hull, a new style fire control equipment with stabilized TVK-3 and TKN-1SM sights for the gunner and commander, an improved V-55U engine (or V-46-5M) and a main gun stabilization system. The original 100 mm D-10T2S gun is maintained. Combat weight is less than 40 tonnes.
T-55M6 (Ob'yekt 155M6) - A more radical upgrade with longer chassis with 6 road wheels each side, a 690 hp V-46-5M diesel engine and with the complete turret with automatic loader and the 2A46M 125 mm main gun of the T-72B. Also, the protection was increased to T-80U level. Optionally, the tank can be equipped with the 1A40-1 fire control system with the 9K120 "Svir" ATGM system (as per the T-72B) or with the 1A42 and 9K119 "Refleks" systems (as per the T-80U). Combat weight is 43 tonnes.
Experimental vehicles
T-54M (Ob'yekt 139) - Not to be confused with the T-54M modernization program. This was a testbed for the new rifled 100 mm D-54, It had the "Raduga" stabilization systems, which were later used in the T-62. These were not completely successful, so further T-55 developments continued to use the D-10 series guns. It is based on the T-54A.
Ob'yekt 141 - Developed by the Kharkiv design bureau from 1952 to 1954 as a testbed for the D-54. In 1955, the "Raduga" stabilizer was installed; however, due to a malfunction work on it was stopped. In the spring of 1959, the Ob'yekt 141 was used as a testbed for the U-5TS; however, due to excessive gas in the crew compartment and a low ammo count of 28 rounds, work on it was stopped.
Ob'yekt 137ML - Prototype of the T-54 with 9M14 "Malyutka" (NATO code: AT-3 Sagger) ATGM.
Ob'yekt 155ML - Prototype of the T-55 with a launcher for three 9M14 "Malyutka" (NATO code: AT-3 Sagger) ATGM mounted on the turret rear.
T-55K used as a testbed for the "Uran" television apparatus. The tank was fitted with a video camera and the footage was transmitted to a receiver in a BTR-50PU command vehicle.

Table of tank models

Characteristics of the T-54/55 models
_ - T-54-1 (Ob'yekt 137) - T-54-2 (Ob'yekt 137R) - T-54-3 (Ob'yekt 137Sh) - T-54A (Ob'yekt 137G) - T-54B (Ob'yekt 137G2) - T-55 (Ob'yekt 155) - T-55A (Ob'yekt 155A)
Weight (tonnes) - ? - ? - 39.7 - ? - ? - 39.7 - ?
Crew - 4 (commander, gunner, loader, driver)
Main gun - 100 mm LB-1 rifled tank gun - 100 mm D-10T rifled tank gun - 100 mm D-10TG rifled tank gun - 100 mm D-10T2S rifled tank gun - 100 mm D-10T2G or D-10T2 rifled tank gun
Machine gun(s) - 7.62 mm SGMT coaxial 7.62 mm SGMT bow mounted 2 × 7.62 mm SG-43 fender mounted 12.7 mm DShK anti-aircraft - 7.62 mm SGMT medium coaxial 7.62 mm SGMT medium bow mounted 12.7 mm DShK anti-aircraft - 7.62 mm PKT tank coaxial 7.62 mm SGMT bow mounted 12.7 mm DShK 1938/46 anti-aircraft (added during routine maintenance since 1972) - 7.62 mm PKT tank coaxial 12.7 mm DShK 1938/46 anti-aircraft (added to the newly produced tanks since 1970, added to the old T-55A tanks during routine maintenance since 1972)
Engine - V-54 12-cylinder 38.88 liter water-cooled diesel 523 hp (390 kW) - V-55 12-cylinder 4-stroke one-chamber 38.88 liter water-cooled diesel 581 hp (433 kW)
Speed - ? - ? - 48 km/h (30 mph) on road - ? - ? - 6.85 km/h in 1st gear 14.66 km/h in 2nd gear 20.21 km/h in 3rd gear 28.99 km/h in 4th gear 55 km/h (34 mph) in 5th gear 6.85 km/h in reverse gear on road - ?
Operational range - ? - ? - 401 km (249 mi) 600 km (370 mi) with extra tanks - ? - ? - 501 km (311 mi) 600 km (370 mi) with extra tanks - ?
Fuel capacity - 215 US gal (810 L) - 254 US gal (960 L)

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