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pa naravno da loze cumur, ali je opet vise vodene pare nego dima
Pitanje danaExhausting smoke and steam
After the steam is used in the cylinders, it enters the smokebox via the blast pipe. As the exhaust steam blasts upward toward the stack, it provides draft for the fire by drawing the gases through the flues and into the smokebox. (Fresh air enters the locomotive through open spaces at the base of the firebox.) The mingled exhaust steam and gases then leave the locomotive through the stack. It's the relatively violent escape of steam from the cylinders that produces the familiar chuff-chuff sound.
As the exhaust is dependent on spent steam leaving the cylinders, provision must be made for exhausting the hot gases, or smoke, when the engineer has the throttle closed. A group of small steam jets called the blower is located in the smokebox for this purpose.
The smokebox also serves to collect partially burned particles of coal from the fire that have passed through the flues. When these accumulate to a depth sufficient to obstruct the flow of gases, some are picked up by the swirling exhaust and thrown out the stack as cinders.
... sta je produkt sagorijevanja hidrogena iliti vodonika iz ćumura? 
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