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Historically, Italy had two unusual dominant track gauges which were legally defined. The gauge of was used for the national Italian rail network and was very similar to the standard gauge. Since the 1930s the gauge, was adopted and gradually replaced the track gauge. A few isolated gauge networks survive. The other gauge, a narrow gauge, was defined at and is very similar to or metre gauge and was thus called "Italian metre gauge". ==Historical legal definitions of 1879== Italian law defined its track gauges from the centres of each rail,〔(【引用サイトリンク】title=Parovoz )〕 rather than the inside edges of the rails, giving some unusual measurements. According to the law of 28 July 1879, the only legal gauges in Italy were , and measured to the middle of the rail, which corresponds to and inside the rail. The middle size has 1,000 mm between the centres of the rails, which explains why it is called Italian metre gauge, in spite of it in fact being 950 mm in gauge when measured from the inside of the rails in the way gauges usually are measured in other countries. A disadvantage of measuring from the centre of the rail is that the width of the rail varies, affecting the gauge. It is easier and more reliable to measure from the inner edges of the rails. 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「Track gauge in Italy」の詳細全文を読む スポンサード リンク
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