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九零式240毫米列车炮在虎头要塞建设之初,日本就计划为其配备410毫米和200毫米的重型火炮,同时,还考虑为其配备可移动的列车炮,进一步提高要塞的作战能力。第一次世界大战末期出现的列车炮在20世纪30年代是各个国家都非常关注的一种作战武器。日本军方认为,列车炮口径大、射程远,在防守战中能起很大的作用。因此,日本在国内修建铁路时,就有意识地修出一些断头的支线,通往重要的要塞。例如东京湾附近的横须贺线、房总线以及东海道线的支线都是为列车炮准备的。1925年,日本陆军科学研究所所长绪
At the beginning of the construction of the tiger fortress, Japan plans to equip it with heavy artillery at 410 mm and 200 mm. At the same time, Japan plans to equip it with a movable train gun to further enhance its fortification capability. The gun fire that appeared at the end of the First World War was a combat weapon of great concern to all countries in the 1930s. The Japanese military believes that the trains of artillery with large caliber and long range can play a significant role in defensive operations. Therefore, when Japan built a railway in China, it deliberately repaired some broken branches and led to important forts. For example, the Yokosuka Line near Tokyo Bay, the Tokyo Metro Line and the Tokaido Line are all prepared for the artillery. In 1925, Japan Army Institute of science director