On August 13, 2025, the Osaka Metro Chuo Line experienced a power outage near Cosmosquare Station, leading to a complete suspension of train services along the line. This disruption caused severe congestion and stranded approximately 30,000 visitors at the 2025 Osaka Expo venue on Yumeshima Island, which is relatively isolated and primarily accessible via this metro line. The outage resulted from an electrical equipment failure responsible for supplying power to the trains. The suspension lasted overnight, forcing many attendees to remain at the Expo site, with some spending the night on benches and inside pavilions. During this period, 23 emergency medical requests were reported from the Expo area, including cases of heatstroke and other health issues, with 36 individuals requiring hospital transport by early August 14. The Osaka Expo Association acknowledged the large number of stranded visitors and indicated that the exact number who stayed overnight was unknown. In response to the incident, the Expo Minister ordered a review of crisis management procedures. Additionally, the disruption led to partial train operations with turnaround services between Yumeshima and Cosmosquare stations. The incident exposed gaps in emergency preparedness for large-scale events in isolated locations. Separately, during the Obon holiday period around mid-August 2025, Japan experienced heavy travel congestion across highways, railways, and airports, with notable traffic jams on major expressways such as the A7, A9, and A10. The U-turn rush on August 16 and 17 saw peak congestion on the Shinkansen and other transportation modes. There were also reports of luggage abandonment by inbound tourists at the Osaka Expo and investigations into fare evasion by students. On August 17, the JR Yokosuka Line briefly suspended operations between Kurihama and Yokosuka stations but resumed service later that morning. Additionally, JR Central reported a rare smoke incident on the Shinkansen, prompting an investigation.