Locomotive Engineers are notorious for letting the engines idle for hours on
end. Being diesel engines they cool down unlike a gasoline engine. With the
engine idling and running cool, the piston rings are not sealing fully to the
cylinder and oil bypasses the rings and collects in the exhaust manifold. The
oil pools and carbons up the exhaust manifold and piping. When the locomotive
is required to operate under full load the oil and carbon catches on fire,
hence the flames and sparks. This is commonly called wet stacking.
At our terminal here in Houston about every 3-4 months we have flames
shooting out the stack 20' in the air. It's kinda cool to watch especially at
night.
Don Pleu
---------------------------------
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