Are steam trains faster than diesel trains?

ton for ton a steam locomotive can and does pull more tons at higher speeds than a diesel locomotive can. The H.P. of a diesel is less effective at faster speeds because more electricity is needed to keep the traction motors spinning at the higher speeds.



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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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The locomotives weigh between 100 and 200 tons (91,000 and 181,000 kilograms) and are designed to tow passenger-train cars at speeds of up to 125 miles per hour (200 kph). Siemens' modern engines produce up to 4,200 horsepower, and the generator can turn this into almost 4,700 amps of electrical current.

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Normal Operating Power for the steam engines was about 1700 Hp per shaft, 3400 Hp total. Max Power output of the engines was about 2500 Hp per shaft, 5000 Hp total.

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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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Mechanical transmission is the simplest type; it is mainly used in very low-power switching locomotives and in low-power diesel railcars. Basically it is a clutch and gearbox similar to those used in automobiles. A hydraulic coupling, in some cases, is used in place of a friction clutch.

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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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Mallard: The world's fastest steam locomotive | National Railway Museum.

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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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Air pollution Steam trains were indeed faster than wagons, and steam ships faster and stronger than sailing ships. But the smoke they sent into the air polluted the air. Then diesel and electric trains came, and they were somewhat cleaner.

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Does Russia still use steam locomotives? No. The last one was manufactured in 1953. They've been replaced by other types of locomotives with efficiency rates higher than 13%.

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