The Coal Machine is a mechanic in the game Five Nights At Thomas.
In Five Nights At Thomas, it'll be at the left of the office, the machine is used to keep the door power on. You'll see a bar of coal at the top-left of your screen. If it's going down you need to go there & add coal to keep the power on. If the power runs out, the door will open, and then Thomas will jumpscare you.
- In Five Nights At Thomas 2, the Coal Machine has been moved to a different room. You must now go to the Coal Machine Camera to refill it.