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?
Factorio – How to Limit Specific Resources to a Cargo Wagon
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While starting the game for the first time, I saw this option in the help.
If you have a requester chest you can set the type and quantity of the items that you want to be delivered there. I've never had robots put things in there that I don't want, however if it is a storage chest then the robots will dump anything that can't go anywhere else in there, this can clog things up if you have active provider chests as opposed to passive provider chests. I have never really needed to use active provider chests so I don't run into that issue.
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Best 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.