In most cases, depending on the loco, water level was usually somewhere between 60 and 70%. Obviously, most of the boiler was filled with boiler tubes through which hot combustion gases passed thus heating the water. Surprisingly, a lot of people think that the boiler was just a cylinder full of water, but the whole process is a bit more complex.
“O Lord God, let me not be disgraced in my old days.”
'We few, we happy few, we band of brothers'
'Who left the bag of idiots open? Seriously, they're everywhere!