I had noticed on one of the pages I had posted previously a small paragraph about A20G's were built with the option of using torpedo's.
Apparently not used very much by the Western Allies.
The Russians liked the idea though & must have decided to load them on the outside of the aircraft. I guess it saved them the hassle of taking off the bomb bay doors as well.
Not to metion the Russian torpedo's look a lot bigger than the bomb bay on the A20G.