Soviet/Russian T-55 Series

References:
Jane's
T-54 and T-55 Main Battle Tank: 1944-2004 by Stephen J. Zaloga; Osprey New Vanguard 102
Tank-Net Discussion Forums

Note: Object is Объект in Russian if you want to Google the net for more designs. Be sure to have the latest internet explorer, a decent antivirus program, firewall, and god knows what else; since the Russian corner of the internet is full of viruses, et al.

Object 155 (T-55)

Acceptance: May 1958
Production:
June 1958 - July 1962
Main Gun: 100mm D-10T2S (43 rounds)
Coaxial: 7.62mm SGMT
Bow Gun: 7.62mm SGMT (Fixed, aimed by driver)
Stabilizer: STP-2 “Ciklon” (Two-Plane)
Engine: V-55 Diesel (580 hp)
NBC: PAZ protective Suite
Notes: Began as deep modernization of T-54.

Object 155K (T-55K)

Main Gun: 100mm D-10T2S (37 rounds)
Coaxial: 7.62mm SGMT
Stabilizer: STP-2 “Ciklon” (Two-Plane)
Engine: V-55 Diesel (580 hp)
Notes. Command version of Object 155. Additional R-112 radio fitted, along with APU.

Object 482 (OT-55)

Acceptance: 1960
Production:
1957-1962
Retirement: 1993
Main Gun: 100mm Rifled Gun (25 rounds)
Coaxial: ATO-200 Flamethrower (460 liters of fuel giving 12 shots)
Bow Gun: 7.62mm MG (Fixed, aimed by driver; 750 rounds)
Notes: Was produced using both T-55 and T-55A models as the base.
(OT-55 Side Perspective View)
(OT-55 Frontal View)
(OT-55 Closeup of Flamethrower)
(OT-55 In Action)

Object 155A (T-55A)

Production: August 1963-1979
Main Gun: 100mm Rifled Gun
Coaxial: 7.62mm PKT
Notes: Introduced lead-impregnated plastic liner (POV) to protect the crew against radiation, along with an improved protective suite which no longer relied on simple overpressure. Due to a lack of internal space to apply the POV, large amounts were applied externally, which can be seen by the fact that the hatches on the T-55A no longer sit flush with the surrounding surfaces.
During the long production run of the T-55A, various incremental improvements were done. In 1970, a DShK-M AAMG was given to the loader to defeat NATO anti-tank helicopters; while in 1974, the KVD-1 laser rangefinder was fitted.

Object 155AK (T-55AK)

Main Gun: 100mm Rifled Gun (37 rounds)
Notes: Command version of Object 155A. Additional R-112 radio fitted, along with APU.

Object 155AD (T-55AD)

Year: 1983
Active Protection: 1030M "Drozd"
Notes: T-55A with Drozd.

Object 155AD-1 (T-55AD-1)

Year: 1983
Engine: V-46-5M
Active Protection:
1030M "Drozd"
Notes: T-55A with Drozd and V-46-5M engine.

Object 155M (T-55M)

Acceptance: April 1983
Stabilizer: “Tsiklon-M1”
Gunners Sight: TShSM-32PB (One Plane Stabilized)
Ballistic Computer: BV-55 Analog Computer
Rangefinder: KTD-2 Laser Rangefinder
Engine: V-55U Diesel (620 hp)
Notes: Deep Modernization of T-55. Equipped with 9K116 “Bastion” ATGM system.

T-55M-1

Engine: V-46-5M (690 hp)
Notes: T-55M retrofitted with T-72 engine.

T-55M2

Notes: Export version of T-55 modernization.

(T-55AM)

Acceptance: April 1983
Stabilizer: “Tsiklon-M1”
Gunners Sight: TShSM-32PB (One Plane Stabilized)
Ballistic Computer: BV-55 Analog Computer
Rangefinder: KTD-2 Laser Rangefinder
Notes: Deep modernization of T-55A similar to the T-55M program.

T-55AM-1

Engine: V-46-5M (690 hp)
Notes: T-55AM retrofitted with T-72 engine.

T-55AM1

Notes: Export version of T-55A Modernization?

T-55AM2

Notes: Export version of T-55A Modernization?

T-55D / Т-55Д

Combat Weight: 41.5 tonnes

T-55D-1 / Т-55Д-1

Engine: V-46-5M (690 hp)
Notes: T-55D retrofitted with T-72 engine.

T-55AD

T-55AD-1

T-55MV

T-55MV-1

T-55AMV

T-55AMV-1