So people still want this, 'If go to' conditions are important but for my use case I have been incredibly stupid.

The solution to auto balancing 10 Iron Ore Stations and 5 Iron Drop Stations and not having trains stop mid way and go reload again when full when a station is turned off is actually ...

Not similar, but relevant:

https://forums.factorio.com/viewtopic.php?f=6&t=64362 Dynamic train schedule
... Which also lists a lot of threads...

https://forums.factorio.com/viewtopic.php?f=6&t=69758 Ability to mark a station as mandatory in a schedule

... and as corona showed us: you can buy ...

""A train should never drive towards a station if it already fullfills the leave condition for that station?"

Almost, but It doesn't have to, and shouldn't be that hard, it should only check things it already knows before it gets to the station, which is cargo only. i.e the train does not know if ...

I strongly believe the current train system is fundamentally broken for a large number of mega base designs. It makes people flock to the LTN mod when really the vanilla system is near perfect with just one major oversight.

I've seen many threads about this online and the response has been that for ...