The T-29 was a prototype medium tank, a modernized T-28 with Christie suspension - a later version of this vehicle was considered for the competition of prototypes which led to the T-34, but by then it was outdated.
This is a fiction design! Because of the huge dimensions of this tank there were several attempts to fit in a larger gun. One of them was , like the T-28/85, T-29/85 where the russians tried to equip the tank with the powerful 85-mm F-30 gun. This gun is also used by the KV-2/85 which is already in FHSW.
This is a fiction design! Another experimental variant of the T-29 which is equipped with the 95-mm tank gun F-39. The barrel was 40 calibres long and could penetrate 65mm armour in an angle of 30° with a distance of 1,000 metres. One prototype was built.