Thank you, adding the "empty train" condition is a good idea, I will try out.

I was aware that this is an edge case, but I want my logic to be robust towards edge and error cases if possible.
I'm currently building a new station in the water and my landfill production could not keep up, that is why ...

I'm a bit stuck on how to configure my trains. My goal is basically: if a train is at a pickup station and a drop-off station needs its freight, it should go there to deliver it. Else it should just stay there. If it gets stuck somewhere else and has no valid goal to go to, it should drive to a ...