T28 Super Heavy Tank The Super Heavy Tank T28 ( at one point and sometimes called 105 mm Gun Motor Carriage T95 ) was a prototype heavily armored tank destroyer designed for the United States Army during World War II . It was originally designed to be used to break through German defenses at the Siegfried Line , and was later considered as a possible participant in an invasion of the Japanese mainland . Sometimes referred to as a super - heavy tank , the T28 was re - designated as the " 105 mm Gun Motor Carriage T95 " in 1945 and then renamed a super heavy tank in 1946 as the " Super Heavy Tank T28 " . Development . The T28 / T95 was designed as a counter to the German heavy tanks . It was also set to be used for attacking the heavy defences expected of the German Siegfried Line . It was first conceived in the spring of 1945 , but proved to be too late to be used in World War II . The original name for the project was to be T28 / T95 . The Pacific Car and Foundry Company designed it for the final push in Europe , but by the time the first tank was completed and ready for combat , the war was over . The original plans called for five prototype vehicles to be built , and eventually for a total of twenty - five tanks to be constructed . As it did not have a turret , but a fixed casemate mount instead for its main armament , and the 105 mm gun fitted could only elevate from 19 . 5° to - 5° and traverse from 10° right to 11° left of the centreline , the T28 / T95 more closely resembled a self - propelled gun , and was redesignated as the T95 Gun Motor Carriage in 1945 , but in June 1946 , the vehicle was redesignated again as Super Heavy Tank T28 . It has been argued that it was neither a super - heavy tank nor a self - propelled gun , but that it was in fact a very heavy tank destroyer , more accurately as an American version of one of the German " Jagdpanzer " - style tank destroyers , intended to take on German heavy tanks . It was also designed to take on heavy German defensive lines . Two prototypes of the T28 were built . They underwent evaluation at the Aberdeen Proving Grounds and the Fort Knox facilities until 1947 . In 1947 one of the T28s was heavily damaged by an engine fire during trials at Yuma Proving Grounds and was broken up and sold for scrap . The T28 never went into service . This was because during the later stages of T28 development and evaluation were overtaken by that of the T29 and T30 turreted heavy tank design . The T29 mounted the same gun as the T28 in a conventional rotating turret . The T30 was developed with a larger - caliber gun and more powerful engine . Due to this the T28 program was terminated in October 1947 . Surviving vehicle . In 1974 the last prototype was discovered abandoned in a back field at Fort Belvoir , Virginia . It is unknown where it spent the intervening 27 years . It is the sole remaining example of these tanks and was exhibited at the Patton Museum of Cavalry and Armor in Kentucky . In 2011 , it was shipped to its new home at Fort Benning , Georgia , where it is currently awaiting display . Design . The T28 was designed and manufactured by Pacific Car and Foundry . The mechanical superstructure was taken from a T23 . The original plan was to build five prototype vehicles , with a production total of 25 . Its total weight when fully equipped would have reached 95 short tons ( 86 tonnes ) . To carry this weight , it used four tracks instead of two , each 12 . 9 inches ( 328 mm ) wide . The outer tracks could be detached for easier transport . After removal they could be fixed together to make a unit that could be towed behind the tank . Due to its extreme weight and low engine power , the T28 had extremely limited obstacle - crossing ability and could not cross any of the portable bridges available at the time , and so was considered impractical in the field and not suitable for production . The T28 had no conventional turret , with a casemate style hull instead , giving it a comparatively low profile . Its main armament was a 105 mm T5E1 gun , in a ball - shaped gun mantlet set into the hull front . Although it was technically a part of a gun mantlet it was really attached to the hull . Due to this it was not a true tank at all , but a " Gun Motor Carriage " . The traverse was limited to 10° right and 11° left , and elevation from 19 . 5° to −5° . When traveling , the gun was locked at the maximum elevation . It also had a . 50 inch ( 12 . 7 mm ) M2 Browning machine gun mounted above the commander ' s hatch . The main gun had a muzzle velocity of 3 , 700 feet per second ( 1 , 130 m / s ) , with a range of up to 12 miles ( 19 km ) . The armor was very thick compared to other tanks of the time , up to 12 inches ( 300 mm ) thick on the front . This was considered heavy enough to provide protection from the German 88mm gun used as tank gun and anti - tank guns . The lower hull front had 5 . 25 in ( 130 mm ) of armor , and the sides 2 . 5 in ( 64 mm ) . The suspension system and lower hull were covered with 4 - in ( 100 mm ) thick steel skirts . The engine was a gasoline - powered Ford GAF V - 8 , delivering 500 hp , which left the vehicle underpowered with a top speed of about 8 mph ( 13 km / h ) and greatly limited its obstacle - climbing capability .