1.前言新干线自1964年开业以来,至1971年虽保持了比较安全的运输,但到1972年以后,运输故障却显著增加。尤其是1974年,由于发生许多运输故障,经常打乱列车运行图,曾受到运输大臣“关于确保新干线安全的警告”。为此,在立即采取“新干线安全紧急措施”的同时,还决定推行确保新干线安全的长远措施。与此同时,于1974年10月成立了“新干线综合调查委员会”,负责对有关提高行车安全 1. Introduction Since the Shinkansen opened its doors in 1964, safer shipping was maintained by 1971, but shipping problems increased significantly after 1972. In 1974, in particular, the Transport Minister was “warned about ensuring the safety of the Shinkansen crossing” because of many transport failures that often disrupted train operation plans. To this end, it also decided to implement the long-term measures for ensuring the safety of the Shinkansen immediately while adopting “emergency measures for the safety of the Shinkansen.” In the meantime, the “Shinkansen Integrated Commission of Inquiry” was established in October 1974 to advise on ways to improve driving safety