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自1963年11月鹤见站发生行车事故以来,对于列车运行安全有关的各种问题,又作了进一步的研究,其中之一是车轮踏面形状问题。兹将迄今研究的情况作以下介绍:
Since the traffic accident at Tsurumi Station in November 1963, further research has been conducted on various issues related to the safety of train operations. One of them is the wheel tread shape problem. I hereby give the following account of the research so far: