The train cannon might have indeed been a very powerful battlefield support weapon during World War II, but after nearly a century of technological advancements post-war, the technology mastered by humans has undergone a tremendous transformation.
A mere train cannon, in front of the missiles, rockets, bombers, and even more sci-fi space-based weapons equipped by modern armies, is practically like a large target.
In terms of military equipment owned by modern armies, dismantling a train cannon, which could still be considered a sharp tool during World War II, only requires two armed helicopters.
So although the Suyia land cruiser seems mighty and terrifying, in reality, this thing is already a historical relic.
In fact, after its actual construction, the Suyia leadership realized that it wasn't practical, and soon abandoned the idea of mass production.
