Are diesel trains environmentally friendly?

“When you take into account the production of railroad equipment and tracks, all of that is very carbon intensive as well,” says Hamilton. “Take the entire picture and trains are actually more polluting than the road buses, even though buses all run with dirty diesel fuel.”



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Environment - Emissions from diesel engines contribute to the production of ground-level ozone which damages crops, trees and other vegetation. Also produced is acid rain, which affects soil, lakes and streams and enters the human food chain via water, produce, meat and fish.

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If we take an overall view of the transport sector, 71% of transportation related carbon emissions come from road users, whereas only 1.8% of emissions stem from rail travel. So in absolute terms, trains are responsible for a lot less emissions than cars.

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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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The main disadvantages of dual-mode locomotives are that they are more expensive to build and mechanically more complex, resulting in higher maintenance costs. They also lose some energy efficiency by carrying around the weight of one type of unused power plant (electric or diesel), while using the other.

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Power plant capacity is far greater than any individual locomotive uses, so electric locomotives can have a higher power output than diesel locomotives and they can produce even higher short-term surge power for fast acceleration.

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Greenhouse gas (GHG) emissions are directly related to fuel consumption. According to EPA data, freight railroads account for just 0.5% of total U.S. GHG emissions and just 1.7% of transportation-related GHG emissions. Moving freight by rail instead of truck lowers GHG emissions by up to 75%, on average.

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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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Finally, the plane is the most polluting means of transport and the one that generates the most greenhouse emissions.

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According to the 2021 U.S. Department of Energy Data Book, Amtrak is 46% more energy efficient than traveling by car and 34% more energy efficient than domestic air travel. For more information on our sustainability initiatives, goals, and projects, read our latest annual report.

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According to the National Geographic Green Guide, which is no longer in publication, you roughly double your emissions if you cancel your plane reservations and drive across the country instead. If you take the train, then you'll cut carbon dioxide (CO2) by half compared to the plane.

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However, as an energy researcher, my decision was motivated by the fact that trains, whether for cargo or passengers, pollute much less than airplanes, sometimes by as much as 73%, and they are more easily electrified than planes.

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Go by train – your most sustainable travel choice Besides walking and biking, you can rest assured that train travel is your greenest option. No matter if electric or diesel-powered. Compared to cars and airplanes, trains emit between 66 and 75 percent fewer carbon emissions.

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This high carbon emission is mainly due to the significant fuel consumption and associated emissions of airplanes. On the other hand, traveling by train offers a more environmentally friendly alternative.

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Shipping via Rail is Environmentally Friendly In fact, moving freight by rail instead of truck lowers greenhouse gas emissions by 75%.

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Elements of the diesel locomotive The diesel engine may operate on the two-stroke or four-stroke cycle. Rated operating speeds vary from 350 to 2,000 revolutions per minute, and rated output may be from 10 to 4,000 horsepower.

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