[MasterEric]

This makes a little more sense if you watch the animation closely.

From what I can tell, when you insert a unit of fuel into the boiler, an LED light starts, and traces a path of lights (known as the STEAM PIPE) between the BOILER and the AIRSHIP's STEAM TANK (this extends from the BOILER, across the tops of the driver station, and across that weird pole some MC is gonna hit). Once a light reaches the end of the path, the pressure is counted.

Keep in mind that if you dump 10 units of fuel at once, each unit must travel behind the other, single-file.

I'm assuming what this line means is that if you dump 50 units of fuel into the boiler, the rate the fuel moves through the STEAM PIPE is faster.