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Welp, here I am with a breakthrough of sorts on an issue not many people care about....
Cam, remember that odd issue with UltimateCarMod's fluid extractor? I've just realized it only occurs with locomotives. Best way to reproduce:

• Hook a UCM fluid extractor to an IR fluid unloader, and pipe it into a UCM fluid tank.
• Open it's GUI, and put a filled bucket of some fluid in the slot.
• Run a tank car filled with a separate fluid over it, no crash.
• Run a locomotive with a separate fluid over it, world is now bricked.
  Kind of letting you know, because this information gives me hope it'll be fixed
  It don't care if the loco's running or not. Still odd it only happens with locos though.

crash-2022-03-12_20.21.35-server.txt

Now this is an interesting find:
The fluid extractor works just fine if there's a pipe between it, and the fluid unloader. But it still bricks saves when directly adjacent to a fluid unloader.