Task: Question Answering
Input (English): Process:  -Coal is loaded into the firebox -The boiler produces steam under high pressure -The steam generated in the boiler flows down into a cylinder -Just ahead of the wheels, pushing a tight-fitting plunger, the piston -The piston is connected to one or more of the locomotive&#x27;s wheels through a kind of arm-elbow-shoulder joint called a crank and connecting rod -As the piston pushes, the crank and connecting rod turn the locomotive&#x27;s wheels and power the train along -An outlet valve opens and the piston pushes the steam back through the cylinder and out up the locomotive&#x27;s chimney -
 Question: What is the effect of the coal is able to be lit on there is no coal available.?
Output (English): against