Factorio train station, one refinery, three fluid wagons

I'm working on a challenge with only trains and necessary pumps for logistics. No belts, no bots, no pipes, no chests, no chained inserters, no unnecessary pumps. One of the trickiest parts was getting all three fluids out of the oil refinery.
The train alternates picking up 2 and 1 fluids, then when the most common one is full it proceeds to the unload station. The rear pickup station and the unload station have the same name, pathing is controlled by closing the signals on each side of the train based on the fluid quantity at the front pickup station.
Blueprint in comments.

[thedogeyoreo]

What kind of hell are you trying to accomplish? But that is pretty impressive to come up with such a setup

[leyn]

When you really dont want to set up oil cracking

[ThatOliveMrT]

Had to slow it down to 0.25x to absorb what's going on. Pretty neat especially considering this is probably more ups fps friendly with the lack of fluid sloshing in pipes

[yeeterbeetus]

Man I’ve been so confused on how to put oil and getting oil out of the wagon and I still have no clue on how to do that

[Kezenmacher]

This is absolutely stupid and useless.. I love it <3

[imbass]

love challenges like this. makes the game less boring keep it up