Itemfilter for Train loading

[Tami]

I want to deliver different goods to different station, but i dont want to use a cargo car for each type of good, so i wish me an option to limit certain slots of a crago train to specific goods, like 2 slots for iron, 2 slots, for copper, 2 slots for coal for example, rest slots are disabled like the tresures.

It would help also if you could link a cargo train with a smart inserter, aslong it is in position in a specific area. For example of build a Station, you can extend the Station with a pole, that is linked itself to the cargo train, so you can connect the the pole with wires.

in overall i wish me an option for an intelligent loading/unloading of a train. For example unload 100 coal in Station 1 and unload 100 coal in Station 2.