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- The first letter indicates the number of leading wheels, the number in the middle indicates the number of driving wheels, and the last letter indicates the number of trailing wheels. For example, a locomotive with 4 leading wheels, 6 driving wheels, and 2 trailing wheels would be classified as a 4-6-2.
www.train-museum.org/2023/03/05/whyte-classification/
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A driving wheel on a steam locomotive. On locomotives with side rods, including most steam and jackshaft locomotives, the driving wheels have weights to balance the weight of the coupling and connecting rods. [10][11] The crescent-shaped balance weight is clearly visible in the picture on the right.
The earlier, Type-A Boxpok wheels had a fewer number of larger holes. The later, Type-B Boxpok wheels had more, smaller holes. The boxpok drivers proved an important modification in high-speed service. Many railroads employed Boxpok disc drivers during the 1930s and 1940s including the Union Pacific on their Big Boys. Photos
The 4-8-8-4 steam locomotive has four leading wheels, two sets of eight driving wheels, and four trailing wheels. They were designed to haul heavy freight in mountainous regions. This locomotive had hinged frames to allow them to negotiate curves.
In using the system, the French counted the axles, the Germans also counted the axles but used letters only for the driving axles instead of numbers and the Americans and British counted the number of wheels. This table shows how the classifications work.
From tank engines and narrow gauge locomotives, to large freight haulers and those pulling high speed express trains, each and every type of steam locomotive operates differently and has a wheel set to match its purpose.
Geared steam locomotives such as Shays, Heislers, and Climaxes do not have a standard wheel arrangement classification system. Instead of being classified by wheel arrangement, they are instead classified by their design and their number of trucks.
May 20, 2022 · There is no general rule for the wheel configuration of steam engines and their usage by their operators, but some of the usages cited include: 0-4-0T - Shunting duties. 0-6-0 - Mixed freight duties. 0-8-0 - Heavy freight duties. 2-6-0 - Mixed traffic duties. 2-6-4 - Fast passenger duties.
