Why does steam come out of a train?

Spent steam is released from the cylinders through the blast pipe below the stack. This arrangement produces a reduction in pressure in the smokebox which draws the firebox gases through the boiler tubes. The harder the locomotive works,the more gas is drawn through the tubes, generating more steam.



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The steam generated in the boiler not only moves the locomotive, but is also used to operate other devices such as the whistle, the air compressor for the brakes, the pump for replenishing the water in the boiler and the passenger car heating system.

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Air pollution Steam trains were indeed faster than wagons, and steam ships faster and stronger than sailing ships. But the smoke they sent into the air polluted the air. Then diesel and electric trains came, and they were somewhat cleaner.

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These massive, track-mounted vehicles, which use a diesel generator to power electric motors and move rail cars carrying cargo or passengers, are major polluters, responsible for a growing share of the emissions that increase cancer risk, shorten lives and worsen smog across California.

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The chimney (smokestack or stack in American and Canadian English) is the part of a steam locomotive through which smoke leaves the boiler. As well, steam locomotive exhaust systems typically vent cylinder steam exhaust through the chimney, to enhance the draught through the boiler.

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Black locomotives became common beginning in 1880, after coal burning engines made grime commonplace. Black was chosen because black locomotives didn't show all the dirt and grime that covered the locomotive during normal use.

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To accumulate the water, water stops employed water tanks, water towers and tank ponds. The water was initially pumped by windmills, watermills, or by hand pumps often by the train crew themselves. Later, small steam and gasoline engines were used.

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The last meter-gauge and narrow-gauge steam locomotives in regular service were retired in 2000. After being withdrawn from service, most steam locomotives were scrapped, though some have been preserved in various railway museums. The only steam locomotives remaining in regular service are on India's heritage lines.

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Compared to other popular forms of travel, such as cars, ships, buses, and planes, trains are one of the safest forms of transportation in the United States.

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Diesel engines, which are commonly used in trains and buses, release a combination of gases and particulates into the air. These emissions include nitrogen oxides (NOx), sulfur dioxide (SO2), and particulate matter (PM), which can produce a strong, acrid smell.

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Modern trains recycle the waste water to use again for flushing.

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