Translations:Cylinder Cocks/1/en
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When steam is no longer being admitted to the cylinders, they quickly cool down. This is due to them being separated from the boiler and the firebox. The steam in cylinders then condenses back into water pretty fast. As water isn't compressible, unlike steam, if enough of it collects in the cylinders and is pushed by a piston, it can break the cylinders and cause catastrophic powertrain failure.