I have never used the loader (Although I know it exists and I know how to use it) but it feels weird, and for me it provides more confusion for learning (And it is not something you can build)
It could be obvious for some people, but definitely not for a new one (What's that arrow for?)
Also you need to put a signal to enter the station (See red circle). This signal tells other train in queue that this station (block) is occupied by another train:
Not everything should be "confirm" (Confirm should be when you change something, so you can confirm your changes). In this case should be back (And in some other windows)
I would delete everything inside the roundabound. You are duplicating routes and creating more problems. Instead of creating more intersections, try to divide the already created exits from the roundabound (I would keep just 4, then divide those)
I have not tested Factorio with Spanish language enabled, but he is right. In the picture, you can also read the description: "Stacks con las mejoras de daΓ±o de bala" Stacks should not be there, is an english word that can be translated as "Apilar" or "Acumulable" (For ...
Broadcast packages cant go through a router. Even if you are using the same switch on different VLAN you will have a routing problem (With different subnets). An UDP broadcast forwarding should probably work (Similar as IP Helper), I have never tested but it should work. Can you provide running-conf...