Steam engines can be pushed beyond their rated capacity. Power output can be increased up to 25 percent each turn (5 seconds). The chief engineer rolls each turn:

On an outstanding success, the engine runs perfectly. On a normal success, the engine runs normally, but increase the wear value of the engine by one. On a normal failure, the engine breaks down and must be repaired (1D20×5 minutes). Additionally, there is a one-in-20 chance for each person in the engine room to be scalded by hot steam. Treat these as burns by normal fire. On a catastrophic failure, the boiler explodes, everyone in the engine room is killed, and the vehicle takes one critical hit for each megawatt of power output.