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The Italian railway signals currently in use have evolved from the ones used at the dawn of the rail era. In Italy, trains drive on the left on double track lines, probably because the first state to set up railways (Britain) chose the left. This led to the need to place signs on the left of the track (except in cases of physical impossibility to mount them conventionally, in which case they are on the right). The Italian State Railways network (''Ferrovie dello Stato Italiane'') uses both light and mechanical (or semaphore) signals. On high-speed lines, trackside signals are replaced by cab signalling and only marker signs for section ends or service areas are installed by the track. Signals are divided into home (''1a categoria'') and distant (''avviso'') categories. ==Home signals== Home signals are placed immediately above the point being protected and must not be passed by trains when showing a red or ‘halt’ light. These can be divided into block, departure, and safety signals: * Block signals are used in normal railway traffic; * Departure signals control the departure of trains from stations; * Safety signals are placed above stations or special points (''e.g.'' junctions, falling rock areas). In some stations, usually larger ones, signals can control safety and/or departure, in which case they are called 'multiple signals’; separate signals will have a plate bearing the inscription "INT" (''interiore'') on the signal closer to the station (possibly followed by a number in case there is more than one internal signal), and "EST" (''esteriore'') on the farther signal. The signals can also indicate the beginning of a block. In case of multiple signaling starting, the starting signal also functions as a block signal. 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「Italian railway signalling」の詳細全文を読む スポンサード リンク
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