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FS Class 640 II : ウィキペディア英語版
FS Class 640 II

The Ferrovie dello Stato (FS; Italian State Railwayas) Class 640 (Italian: ''Gruppo 640'' is a class of 2-6-0 'Mogul' steam locomotives in Italy. Commonly nicknamed "''Signorine''" (Italian: 'young ladies'), a nickname shared with the similar Class 625, these locomotives were the first superheated steam locomotives in Italy.〔Kalla-Bishop, p. 49〕
==Design and construction==
When the FS were created in 1905, Chief Mechanical Engineer Giuseppe Zara undertook a process to design of a standard range of locomotives; one of these was the Class 630, a light express engine which, together with the other designs, shared the features of being compound locomotives. However, with the diffusion in Germany (then in close ties with Italy because of the Triple Alliance) of the Schmidt superheater, a decision to build there a batch of 24 non-compound and superheated version of the Class 630 (keeping all the other features, including the Italian bogie and the peculiar inside-cylinders/outside valve chests and valve gear) was taken.〔Cook and Hollingsworth, p. 80〕 Results were highly successful, and subsequently almost all steam locomotives in Italy would be built with simple expansion and superheating.
The first locomotives were built by the German firm Schwartzkopff (as Italian industry lacked experience with the superheating technology), with other Italian firms building the rest, for a total of 169; four more Class 640 were added in 1951 when the railway company for which they had been built was incorporated in the FS.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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