Why are American trains diesel?

The diesel engine drives an alternator, which produces electricity to run electric motors mounted on the locomotive's axles. The internal combustion engine was a dramatic improvement in efficiency over the steam locomotive, making substantial savings possible in maintenance and the elimination of widespread facilities.



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The short answer is that railroad electrification costs much more then dieselization, and in most cases it would not allow significant improvement of operations. Consider the costs involved: You already need to maintain a set of tracks and diesel locomotives.

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CLIMATEWIRE | The first U.S.-made high-speed bullet trains will start running as early as 2024 between Boston, New York and Washington, with the promise of cutting transportation emissions by attracting new rail passengers who now drive or fly.

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Locomotives. Amtrak operates diesel, electric, and dual-mode (diesel or electric) locomotives.

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Some locomotives collect electricity from overhead cables, while others take power from a third “live” rail on the track. It is very expensive to build the lines or rails that carry the electric current, but electric locomotives are cleaner, quieter, faster, and more reliable than steam or diesel engines.

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A train engine requires about a hundred litres of fuel to get it started. So it wouldn't be economical if the engine is stopped and started frequently. This apart, if the engine is stopped, the moving parts' lubrication will also come to a halt.

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The decision not to procure new diesel trains had already been made in 2020. As soon as trains have reached the end of their economic life, they are now to be replaced with battery trains. Trains that are theoretically still operational are to be used on non-electrified lines during the transition.

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Rather, the term is more specific: A freight train can move one ton of weight about 450 miles on a single gallon of gas. To match this mileage, a one-ton car would have to get 450 mpg, and a two-ton vehicle would have to get 225 mpg. To car owners, this seems unbelievable. How can railroads do it?

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There are many reasons for this. There is limited service between cities (Amtrak says it runs 300 trains with about 87,000 passengers per day), freight is often prioritized over passenger service in the U.S., and trains and facilities are often outdated.

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Engine compartment The massive Cummins 95-liter V-16 diesel prime mover. In most Chargers, this engine produces 4,400 horsepower. Florida's Brightline version produces 4,000. Each cylinder has more volume than an entire Lamborghini Huracán engine.

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DC motors are used on trains is because of their high torque and good speed control. Compared to AC motors, DC motors can provide industry applications with a fine balance of strong starting torque and controllable speed for seamless yet precise performance.

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It probably comes as no surprise that in a global 2019 survey of railroad efficiency, the top two places went to Japan and Hong Kong, with scores of 6.8 and 6.5 (out of seven) respectively.

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