Why do steam locomotives puff black smoke?

Darker or blacker smoke is an indication that small fuel particles (coal, wood, fuel oil, etc.) have made it through the firebox unburned and are therefore wasted. Light or nearly invisible exhaust means that the locomotive fuel is mostly burned and transformed into heat, carbon dioxide, water, and trace elements.



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Re: Color of smoke Black and grey indicates unspent fuel such as coal or oil. Brown is poor grade coal or oil or is wood smoke. White is simply steam condensing in the cooler air.

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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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The new national system painted almost all its steam locomotives black. This was commonplace in many countries by the 1920s, certainly for goods engines, on grounds of cost. The red wheels and frames were intended to make it easier to spot cracks and other defects.

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The pistons push or pull the rods connected to the drive wheels, providing the force needed to move the locomotive. The steam is exhausted through a nozzle and up through the smokebox into the stack. This action produces the “chuff chuff” sound heard when the locomotive is moving.

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Diesel engines are much more efficient than steam engines, but the combustion in the steam engine's firebox can be more carefully controlled and, so, possibly produce less of the types of pollution caused by imperfect combustion.

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Coal fired steam locomotives do produce a lot of CO2 emissions but also aerosols which has a cooling effect (global dimming), which cancels out some of the warming produced by CO2. Diesel locos probably produce less CO2 but also less aerosols that would cancel out the CO2.

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Railroad officials said that with smoking banned, cars would be cleaner, cost less to maintain and have more seats available during rush hour. Railroad officials had advocated a ban based on concerns about health and overcrowding.

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It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomotive's boiler to the point where it becomes gaseous and its volume increases 1,700 times.

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