I come here to find many help about my little problem, I haven't find a solution before...
I would like make a trains system in 3 stops for any trains:
First stop : Making resource/item (Ores stops, production of green circuits, production of iron/copper/steel plates, etc..)
Second stop : A special waiting bay for type of train cargaison. (10 waiting for green circuits for exemple, 5 for plastics, etc...)
Third stop : Stop informed by the logic circuit, according to demand,
And back to first stop.
The network will fetch a train on a waiting bay, any train...
For exemple, I dont want a train with a shedule type: Production layout > Waiting bay > go to Layout A if demand is true.
But : Production layout > Waiting bay > if demand on layout A, go to layout A. if demand on layout B, go to layout B, etc...

Right : Production stop
Top : Waiting bay
Left : Stops with demands
So, I would like something like that, lot of waiting bay, (then, if I must enlarge this, I can do it easily)
https://youtu.be/xVPc3g94p6I?t=30m20s
Soo, thank you for your help

(And if that already have an answer, copy me link
