Trains is also one of my favorite aspects of the game!
I also made the parametrized train stations first and the variable to for stack sizes is so nice!
I also tried making a schedule with only interrupts for all trains. But that don't really works because the trains always just goes to the closest outpost. But I have been thinking if I connect every train stop to a radar. I can also check demand for a specific resource before I enable the stop
And for my mall, I thought about making a single fluid train stop for all fluids. Because pumps can have a filter now, so maybe it can work, haven't tried it tho
I don't have 24 free hours, but damn if iam going to try to spend them all on Factorio anyway!