Generic interrupts

[Spiritfarer]

Do i really need physical [Greenbox] Drop station to make [SomeItemIcon] Drop stations work?
In this fff https://factorio.com/blog/post/fff-395
There is a target [GearIcon] Drop, thats okay. But then there is a screenshot with [GreenBoxIcon] Drop target. And to make this you should have useless physical [GreenBoxIcon] Drop station in the world. Or i don't understand something?
I mean i'll have Drop stations for different items with different icons, and will have [GreenBoxIcon] Drop station which will just exist to be some kind of marker and won't be used by any train?

[Fel]

The "green box icon" is a wildcard, meaning that it it will effectively replace it automatically based on the content of the cargo (because of the condition being "cargo 'any item' != 0")
This means that if the train has loaded iron ores, it would try to go to a station named with the iron ore symbol followed by "Drop" as the name.

This is what is shown in the same screenshot on the left, the "temporary" stop.

What they did in that example is make a train that could be used for anything, meaning that the train could be used to pickup virtually any item and it would find the correct station(s) to unload it if such station exists (based on the naming).

It is not something you generally need to be doing, this is something for more advanced train users that previously required mods to be available (or some extreme circuit logic stuff).

[Spiritfarer]

Yea i undestood how it works. Problem is i don't know how to make Wildcard Drop target. I mean i know how: by building a station with *[GreenBoxIcon] Drop* name and assigning it to interrupt as a target. But then i'll have *[GreenBoxIcon] Drop*.
I tried to explain it here https://www.reddit.com/r/factorio/comments/1ghv03g/trying_to_understand_generic_interrupts/
It works. But on 3rd screenshot you can see an [GreenBoxIcon] Unload station between Stone and Copper Unload stations. And idk whats the purpose of this station except being a generic marker for other stations and i don't like that i need to have this physical station in the world to make things works

[Fel]

You don't make "green box icon" unload stations, those whould have no purpose and would never be targetted by the interruption.

[Spiritfarer]

But how then i'll make a wildcard unload target for interrupt if target for interrupt is a physical train station?

[Spiritfarer]

Originally posted by Fel:

You don't make "green box icon" unload stations, those whould have no purpose and would never be targetted by the interruption.

nwm. I see. I can type anything in station name, i thought i can only choose station, but now i see. Thanks for help

[Fel]

You can just type the unload target directly instead of selecting an existing one.