The Japan Railway Construction, Transport and Technology Agency, or JRTT, has decided to abandon the plan to open the extended section by the end of fiscal 2030
https://www.japantimes.co.jp/news/2024/04/25/japan/hokkaido-shinkansen-plan-delay/
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https://www.japantimes.co.jp/news/2024/04/25/japan/hokkaido-shinkansen-plan-delay/
Hokkaido Shinkansen extension to be delayed beyond fiscal 2030
www.japantimes.co.jpAccording to sources, tunnel construction for the section has proven challenging.