The top part of the steam chest is where the steam enters, the piston valve controls which end of the lower cylinder block is filled with steam. Exhaust steam is also controlled by the upper piston and is directed up the stack to produce a draft for the fire. The two knobs protruding from the upper portion are removable plugs so that oil can be put into the cylinder after a day of running to prevent rust. On the other side of the engine is a lubricator which operates as the wheels turn to inject steam oil into the cylinder. On the bottom of the chest are the cylinder cocks, these are controlled from the cab. These can be opened to let any water that may have collected out without damaging the cylinder head or the piston. After the cylinder block has warmed up they can be closed to allow more of the steam to work on the piston for more power.

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