I designed the enginespec for the Huge Boy so that it has a 320-psi boiler and increased capacity, but it is not capable of very high speeds as its boiler does not produce enough steam to feed her voracious cylinders above a certain speed. I figured that firebox efficiency would not increase proportionally and therefore, even if you frantically hit the spacebar, she wouldn't be able to go as fast as a Big Boy...who knows, maybe the "production" model will work better...
