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The ALn 772 (''Automotrice Leggera a nafta'', Light Diesel motor car) series are a group of Diesel railcars built for the Italian public railway company Ferrovie dello Stato (FS) between the 1930s and the 1950s. As the first project in Italy to abandon the automobile-derived design and adopt a comprehensive "rolling stock" approach, it represents the link between the simple and sturdy ''Littorine'' and the modern Diesel units. ==Background== The design of the ALn 772 series draws on the well-established experience that Fiat built into the first railway engines ordered by the Fascist government of Benito Mussolini, the ATR 100 and the later ''Littorine'' ALn 56 and ALn 556. The increasing demand for passenger transport and the growth of the tourism business during the 1940s, driven by the government's sponsorship of mass tourism (''villeggiature popolari'') and by the transformation of the railways into mass transport, required FS to put into service a growing number of faster and more comfortable passenger trains. This new generation of rolling stock was to supplement the existing Littorine on the new ''Direttissimo'' and ''Rapido'' services (two kind of fast links between major cities). The service requirements called for a huge quantity of new stock in a limited time frame. Rather than buying more units of the existing specialized designs, FS decided to specify a single "unified" type which would be able to fulfill different mission profiles. Maintenance operations would also benefit from the availability of standard spare parts, a quite unusual feature in Italy at the time. The specifications required the new units to provide not only higher speeds but also increased capacity and better passenger comfort; at least 70 well-spaced seats, 1st- and 2nd-class only, were mandated. The approved design had a total of 72 seats, hence the ''772'' designation; the doubling of the leading number indicates multiple unit capability. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「FS Class ALn 772」の詳細全文を読む スポンサード リンク
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