How much torque does a train have?

A locomotive can generate more than 60,000 lb-ft of torque. But in order for it to use this torque effectively, the eight wheels on the locomotive have to be able to apply it to the track without slipping. The locomotive uses a neat trick to increase the traction.



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While the average car engine has about 200 horsepower, locomotive engines typically range from 2,000 to 4,500 horsepower. Train operators rely on diesel power across the full range of rail power applications.

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Once the train is rolling, an engine with 110,000 lb tractive effort should be able to maintain 11-12 mph with at least 200 cars-- maybe 300 or more.

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Modern locomotives use electric traction instead of gears as electric traction is much more flexible than gears. Diesel fuels generators from the combustion engine and transform the energy using an alternator, which runs the traction motors.

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High torque: As a train is considered a heavy load, DC motors are well suited due to their high torque. This means that the motor can drive a consistent level of power over longer periods of time, ideal for trains that operate over 12 hours per day.

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Engines in mainstream cars and trucks typically generate 100 to 400 lb. -ft of torque. That torque is created by the pistons within an engine as they reciprocate up and down on the engine's crankshaft, causing it to rotate (or twist), continuously.

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The SD45s were good, but not enough for the railroad. Union Pacific reached out to EMD for more power, and the result was the behemoth EMD DDA40X. Often cited as both the largest and most powerful diesel-electric locomotive ever built, the 98-foot, 5-inch, 475,830-pound machine is staggering.

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The Union Pacific Centennial is the largest and most powerful diesel locomotive ever built.

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The average fuel consumed per kilo- meter for all passenger and cargo trains is 7.97 L/ km. This value for local, trafficking, railway track laying and maneuvering trains is 7.92 L/km.

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