How can I limit a specific resource to a cargo wagon?

Question

I have a train station that loads iron into a train for export, and imports coal from a different train. I have this problem where iron is being loaded into the coal train. Is there a way I can place a logistics filter on the wagon to stop iron from coming in?

Gedas · Accepted Answer

You can restrict the slots of the coal cargo wagon to only allow coal (middle-click by default). If it already contains coal, it won't even ask what should go into that slot.
In the newest version trains can be blueprinted, so you might even be able to make a blueprint of the cargo wagon with the restricted slots, and make copies with already-restricted slots. But I haven't tried this since train blueprints are rather new.

How can I limit a specific resource to a cargo wagon?

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