T-64 can be identified by its exhaust vent in the rear, and smaller roadwheels if compared with T-72.
Shadow of Chernobyl Edit
One derelict T-64 can be seen in the area of the Freedom HQ in Army Warehouses, another one can be found near the merc outpost. More can be seen recently destroyed on the road to the Chernobyl NPP, used by the military to reach the center.
In Clear Sky, the same T-64s found in the Army warehouses are seen here. A footlocker containing a loaded RPG-7u can also be located near it.
There is also another one that recently appeared in the Red Forest after the large emission, which has a Space Anomaly above it.