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It has been 24 years since the last eruption of Mt. Usu. As the volcano is said to erupt every 20 to 30 years, local governments are becoming increasingly vigilant. This fall, evacuation drills were carried out in various regions. It is encouraging to see that people are well prepared for volcanic eruptions. It was 23 years between the last eruption and the one before that. In other words, the previous cycle has been exceeded, so it is true that an eruption could occur at any time. What is of concern is the transportation aspect. During the last eruption, the Hakodate Main Line Mountain Line was used as a detour. However, can it be used as a detour now? It is necessary to prepare for emergencies, including for freight and passengers. Please take a look.