It is also a good way to raise the "worth" of producers in the verse.
We just had half a chapter about how the prince doesn't get any respect because his class doesn't let him be a warrior after all
After all, three men can keep a secret if two of them are dead.
Kaushman's passed, the Government wants to be the last one standing, so that leaves that elf that was helping Kaushman that one time.
Since the only production of carbon mono or dioxide is gonna be breathing it's very likely most of that could get handled by the same wind magic propelling the train.
Well, except for emergency stops and exits.