A 4-8-8-4 in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a four-wheel trailing truck. Only a single model of locomotive has ever used this configuration, which is commonly known as "Union Pacific Big Boys" after the railroad that operated them. Other equivalent classifications are: The equivalent UIC classification is refined to (2′D)D2′ for Mallet locomotives.
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- 4-8-8-4 (es)
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| - A 4-8-8-4 in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a four-wheel trailing truck. Only a single model of locomotive has ever used this configuration, which is commonly known as "Union Pacific Big Boys" after the railroad that operated them. Other equivalent classifications are: The equivalent UIC classification is refined to (2′D)D2′ for Mallet locomotives. (en)
- En la notación Whyte para clasificar locomotoras de vapor según su disposición de ruedas, una 4-8-8-4 es una locomotora con cuatro ruedas en un boje de guía ubicado en el frente de la máquina, dos juegos de ocho ruedas motrices y un boje con cuatro ruedas de apoyo en la parte trasera. Otras clasificaciones equivalentes son:Clasificación UIC: 2DD2 (también conocida como y ): 240+042: 46+46: 4/6+4/6 La clasificación UIC es definida como (2′D)D2′ para locomotoras tipo Mallet. (es)
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| - A 4-8-8-4 in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with a four-wheel leading truck, two sets of eight driving wheels, and a four-wheel trailing truck. Only a single model of locomotive has ever used this configuration, which is commonly known as "Union Pacific Big Boys" after the railroad that operated them. Other equivalent classifications are:
* UIC classification: '2DD2' (also known as German classification and Italian classification)
* French locomotive classification: '240+042'
* Turkish locomotive classification: '46+46'
* Swiss classification: '4/6+4/6' The equivalent UIC classification is refined to (2′D)D2′ for Mallet locomotives. 4-8-8-4 Big Boys were only produced for the Union Pacific Railroad. Twenty-five such engines were built between 1941 and 1944, numbered 4000 to 4024. Eight of these locomotives survive, seven of which are on static public display at various sites in the United States. Union Pacific announced plans in August 2013 to restore No. 4014 to operation for use in mainline excursion service. No. 4014 underwent restoration between 2016 and 2019, and completed its first post-restoration test run on May 2, 2019. The UP Big Boys were an expansion of the 4-6-6-4 "Challenger" type articulated locomotive. Adding four driving wheels increased the pulling power of the locomotive and reduced the need for helper locomotives over steep grades. Although their wheels were an inch (25.4 mm) smaller than those of the Challengers, they were still able to sustain similar high speeds. Other American railroads considered buying 4-8-8-4s, including the Western Pacific Railroad, which already rostered large 2-8-8-2s and 4-6-6-4s, but diesel locomotives were gaining popularity and soon were able to displace these Big Boy locomotives. (en)
- En la notación Whyte para clasificar locomotoras de vapor según su disposición de ruedas, una 4-8-8-4 es una locomotora con cuatro ruedas en un boje de guía ubicado en el frente de la máquina, dos juegos de ocho ruedas motrices y un boje con cuatro ruedas de apoyo en la parte trasera. Otras clasificaciones equivalentes son:Clasificación UIC: 2DD2 (también conocida como y ): 240+042: 46+46: 4/6+4/6 La clasificación UIC es definida como (2′D)D2′ para locomotoras tipo Mallet. Las únicas locomotoras 4-8-8-4 importantes fueron las de la clase Union Pacific 4000 "Big Boy".Las UP Big Boys eran una expansión de las locomotoras tipo "Challenger" 4-6-6-4 articuladas. Se le colocaron grandes ruedas de tracción para permitir operar trenes de carga a altas velocidades en terrenos con pendientes. Se colocaron dos juegos de ruedas de tracción adicionales para incrementar el poder de arrastre y evitar el uso de locomotoras auxiliares para superar las pendientes con trenes de gran tonelaje. Otros ferrocarriles estadounidenses consideraron comprar las 4-8-8-4, incluyendo el , el cual ya tenía en su parque grandes y , pero las locomotoras diésel ganaron popularidad y pronto pudieron reemplazar a estas máquinas monstruosas; se convirtieron en un ícono del Union Pacific Railroad. (es)
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