Satisfactory Trains: A dumb solution to a dumber problem - customizing train car resources per car

I want to be able to say exactly what resource is on exactly which freight car in a train. I didn't come up with a good solution, but I did come up with a solution.

This is it.

It's a matrix of train stations that is (train length) x (resource type) big. It's kinda crazy, but it does work.

The per-train per-stop customization (the gear icon) in the timetable isn't sufficient for what I want to do in certain (somewhat common) cases.

(I said "it should work" in the video, but it does work. I tried it :)