alright thanks for the help but after this bit >

Add a decider combinator. With green wire, connect the roboport with the input of the decider. With the other wire color (red), add a wire from the constant combinator to the input of the decider.
Add a condition to the decider combinator. Set it to ...

Hello !

I've been wanting to make a simple train setup to push ammo, repair kit, walls and such from a central Supply Train Station to my different Defensive line stations. The train is a one wagon, one fluid wagon fill with light oil.

I have zero understand of logic circuit or nearly zero ...