Spent Nuclear fuel can't be shipped by trucks.

Origin station:

Destination station:

They are on opposite sides of the map, the route is traversable.

Even manually assigning a truck to the route produces no results. It just sits there.

Save file (no mods):
Nuke Waste Not moving.save

Files not imported: Nuke Waste Not moving.save

I believe this issue no longer exist and I'm closing it for now. This save file is corrupted as well so I cannot test this exact scenario.

If you run into this issue again, please let us know.