A "Berkshire" type steam locomotive refers to a steam locomotive built with a 2-8-4 wheel configuration. The design was initially intended to improve on the USRA Mikado design (2-8-2), which was deemed to lack sufficient speed and horsepower. That was overcome by the inclusion of a larger, 100-square-foot (9.3 m2) firebox, requiring an extra trailing axle, giving the locomotive its distinctive 2-8-4 wheel arrangement. Only two "Berkshire" type steam locomotives are in operating condition today: Pere Marquette 1225 and Nickel Plate 765.
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| - A "Berkshire" type steam locomotive refers to a steam locomotive built with a 2-8-4 wheel configuration. The design was initially intended to improve on the USRA Mikado design (2-8-2), which was deemed to lack sufficient speed and horsepower. That was overcome by the inclusion of a larger, 100-square-foot (9.3 m2) firebox, requiring an extra trailing axle, giving the locomotive its distinctive 2-8-4 wheel arrangement. Only two "Berkshire" type steam locomotives are in operating condition today: Pere Marquette 1225 and Nickel Plate 765. (en)
- Una locomotiva a vapore di tipo "Berkshire" indica una locomotiva a vapore con rodiggio 2-8-4 (secondo la notazione Whyte). Il progetto fu inizialmente pensato per migliorare le Mikado USRA (2-8-2), che si riteneva mancasse di velocità e potenza sufficienti. Ciò fu superato con l'inclusione di un focolare più grande da 9.3 m2, che richiedeva un ulteriore asse posteriore, conferendo alla locomotiva il suo caratteristico rodiggio. Ad oggi, sono funzionanti solo due locomotive "Berkshire": La Pere Marquette 1225 e la Nickel Plate Road 765. (it)
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| - A "Berkshire" type steam locomotive refers to a steam locomotive built with a 2-8-4 wheel configuration. The design was initially intended to improve on the USRA Mikado design (2-8-2), which was deemed to lack sufficient speed and horsepower. That was overcome by the inclusion of a larger, 100-square-foot (9.3 m2) firebox, requiring an extra trailing axle, giving the locomotive its distinctive 2-8-4 wheel arrangement. The name of "Berkshire" was chosen for the 2-8-4 type based on the Lima Locomotive Works testing on the Berkshire Hills of the Boston & Albany Railroad. After the Class A-1 successfully outperformed a Class H-10 Mikado, the Boston & Albany Railroad became the first to order the new Berkshires. Over 600 were built by the Lima Locomotive Works, the American Locomotive Company, and Baldwin Locomotive Works. A total of nineteen different railroads purchased Berkshires, including the Erie Railroad, who owned 105 Berkshires, more than any other railroad; the Chesapeake & Ohio Railway, who nicknamed theirs the Kanawhas; and the Louisville & Nashville Railroad's, whose locomotives were technically designated as Class M-1 but were referred to as "Big Emmas". Only two "Berkshire" type steam locomotives are in operating condition today: Pere Marquette 1225 and Nickel Plate 765. (en)
- Una locomotiva a vapore di tipo "Berkshire" indica una locomotiva a vapore con rodiggio 2-8-4 (secondo la notazione Whyte). Il progetto fu inizialmente pensato per migliorare le Mikado USRA (2-8-2), che si riteneva mancasse di velocità e potenza sufficienti. Ciò fu superato con l'inclusione di un focolare più grande da 9.3 m2, che richiedeva un ulteriore asse posteriore, conferendo alla locomotiva il suo caratteristico rodiggio. Il nome "Berkshire" fu scelto per le locomotive costruite dalla per la collaudate sulle Berkshire Hills nel 1925. Non appena le A-1 surclassarono con successo le Mikado H-10, la Boston & Albany Railroad fu la prima compagnia a ordinare le Berkshire. La , la American Locomotive Company e la Baldwin Locomotive Works ne costruirono più di 600. Furono usate da un totale di 19 compagnie, tra cui la Erie Railroad, che ne aveva 105, più delle altre; la chiamò le sue "Kanawhas" e la Louisville & Nashville Railroad's, le cui locomotive erano classificate "classe M-1" furono invece soprannominate "Big Emmas". Ad oggi, sono funzionanti solo due locomotive "Berkshire": La Pere Marquette 1225 e la Nickel Plate Road 765. (it)
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