What size are the wheels on a diesel locomotive?

Freight locomotives generally had driving wheels between 40 and 60 inches (1,016 and 1,524 mm) in diameter; dual-purpose locomotives generally between 60 and 70 inches (1,524 and 1,778 mm), and passenger locomotives between 70 and 100 inches (1,778 and 2,540 mm) or so.



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Fuel Tank. This huge tank in the underbelly of the locomotive holds up to 5,500 gallons (20,820 liters) of diesel fuel, plus an additional 300 gallons (1,135 liters) of coolant, and 250 gallons (946 liters) of engine oil.

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Today's train locomotives are already quite fuel efficient, especially compared to trucks. In fact, trains can haul one ton of goods an average of more than 480 miles on just a single gallon of fuel, making them 3-4 times more fuel efficient than trucks.

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It is the policy of the largest US railroad to shut down engines for fuel conservation. However, besides temperature there are other reasons to leave an engine running. Among these are to preserve a supply of air to the trains air brake system or to ensure the locomotives batteries remain charged.

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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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Each motor drives a small gear, which meshes with a larger gear on the axle shaft. This provides the gear reduction that allows the motor to drive the train at speeds of up to 125 mph. Each motor can weigh over 6,600 pounds (3,100 kilograms) and draw more than 700 amps of electrical current.

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A Brief History. As wireless technologies advanced in the 1960s, freight railroads began adding extra locomotives to the rear of trains to give them enough power to climb steep hills. This is how distributed power was born.

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Generally, a single wheel of a freight train can weigh anywhere between 250 to 500 pounds (113 to 227 kilograms). However, it's important to note that this is just an average range, and the actual weight can differ based on factors such as wheel design, size, and material composition.

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While many of us change our car tires every 50,000 miles or so, Metro rail wheels can travel as far as 700,000 miles before they need to be replaced. Good thing because changing the wheels on a single rail car can take more than a week, depending on the design of the car.

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The life expectancy of diesel-electric and electric locomotives is expected to be similar—about 25 years. Both types of motive power are subject to technological obsolescence.

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Freight and passenger rail rely almost exclusively on diesel power. The latest diesel innovations contribute to cleaner air and reaching climate goals.

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As with internal combustion engines that are used in more traditional ways, engines used as power generators in diesel electric trains are also considerably more efficient thanks to the use of turbochargers.

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