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日本国营铁路的营业总里程有21,000公里,到1975年底累计已有10,002.7公里安装了自动闭塞装置。日本铁路首次安装自动闭塞装置是在1904年,使用美国USS公司的圆盘形自动信号机,直流轨道电路。1923年改用F形臂板信号机,交流轨道电路。F形臂板信号机有上下两个臂板,分别表示本区间和下一区间有无列车占用,两个臂板组合起来构成三显示信号。由于这种信号机能见度不好,1924年改装色灯信号机。当时主要安装在东海道干线上,主要目的是提高行车密度。1928年开始由本国生产有关信
Japan’s state-owned railways have a total operating distance of 21,000 kilometers. By the end of 1975, a total of 10,002.7 kilometers had been installed with automatic blocking devices. The first installation of an automatic blockage device on the Japanese railroad was the use of a disk-shaped automatic signal and DC rail circuit from the USS Company in 1904. 1923 switch to F-arm signal, AC track circuit. F-shaped arm signal machine has two upper and lower arm plate, respectively, said the interval and the next section of the train occupied, the two arm plate combined to form a three-display signal. Due to poor visibility of this signal, 1924 modified color lights signal. At that time, it was mainly installed on the Tokaido Main Line, with the main purpose of improving traffic density. 1928 Beginning by the domestic production of the letter