Which is better steam engine or diesel engine train?

Diesels replaced steam locomotives because that's what they did - they are more efficient because they cost less money to run. This article, written by US locomotive engineer Al Krug in a series of newsgroup posts, tries to explain the power questions that show how diesels are more efficient than steam locomotives.



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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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Diesel locomotive engines are a major contributor to air pollution. The culprits are NOx SO2. Both are readily produced by diesel locomotives and both cause an array of health and environmental problems.

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Diesel engines deliver better acceleration, towing, and hauling potential than their gasoline counterparts. This is because within a diesel engine, the piston rises to the top of the cylinder, while in a gasoline engine it stops short. Diesel engines compress more air faster, delivering more power to get work done.

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What is the most famous diesel locomotive in the history of railroading? Arguably, the classic Electro-Motive “F-unit” can lay claim to the title. The Electro-Motive “F-unit”: Born in the autumn of 1939, it would be produced, in eight different models, until 1960 and would number more than 7,500 strong.

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Trains Emit Less CO2 Than Other Transport Methods Recently developed hydrogen-powered trains are the most eco-friendly trains in the world, emitting nothing except steam as a by-product and creating very little noise.

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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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The timeframe of this process varied by country. Railfan & Railroad stated in 2022 that the only places on earth to see steam locomotives in revenue freight service are small switching operations in China, North Korea and Bosnia, but that these were sporadic at best. Tourist locomotives are still in regular use.

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