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FS Class 685
The Ferrovie dello Stato (FS; Italian State Railways) Class 685 ((イタリア語:Gruppo 685)) is a class of 2-6-2 'Prairie' express train steam locomotives. These are colloquially known as ''Regine'' ('Queens' in Italian), mirroring their fame as one of the most successful and appreciated Italian steam locomotives.
==Design and construction==
The Class 685 was the simple-expansion and superheated version of the preexisting FS Class 680 locomotive, the premier express locomotive in Italy up to that date; while discarding the complicated compound feature, the 685 nonetheless kept the unusual feature of having the cylinders arranged in pairs, with each pair being served by a single piston valve with crossed ports (a feature typical of the Plancher engine of the Class 680 and other Italian locomotives).
The first 106 locomotives were built up to World War I, and had right-hand drive; construction resumed in 1920, and the remaining 165 were all built, up to 1928, with left-hand drive. Of the latter, 30 were built from the beginning with Caprotti valve gear, after it had been tested first on a FS Class 740 locomotive and then on other four 685 locomotives; all of these were initially reclassified as FS Class 686 locomotives, but were later placed again into the Class 685.
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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