Oil delivery.
For my new flamethrower!
Yeah!
Yeah...

I should be more careful.
The circuit network is a cool tool. Here I've set up a speaker that rings when the wagons are almost empty and the train is about to leave, to let me know when to step away from the tracks.
The combinator checks if oil < 400 and, if true, forwards the signal to the speaker. You can't choose an exact value, because the counter drops so fast that it's probably skipped almost every time. And when the train is not at the station, oil is always equal to 0. That's annoying.
It's getting tricky now. Next steps:
- reroute the train
- build a dedicated line for green circuits (if only I had known earlier)
- ...
- basically redesign the entire thing!
