“It’s a permacube,” the engineer said. “Won’t run out until you die of old age. You don’t turn it off. Just let it run out of coal. Toss in a lump, and it’ll start up on its own after a minute. We don’t use the lesser demons to run our steam engines like some do. This is just as good, and this baby will outlast you.” He slapped the side of the bike, and the handlebars fell off, clattering to the ground. He cursed and bent to pick them back up. He started reattaching them to the frame with a wrench.
