Good idea.

That's an interesting idea, AI

Looks interesting.
I got one idea, if you would want to implement v2 maybe. In USSR concrete blocks used waste products like metallurgical slag as a filler. They were literally called "slagblocks" and contained up to 50-60% of slag by weight.

In the game, there's no slag, but there's ash, a final product of waste burning. Ash has no other purpose as being exported at customs.
You might give it another purpose by using it as an ingredient for concrete blocks.

I like the placement of the cargo stations, nice work.