Isumi Railway Faces Closure Decision by 2027 After Derailment

Isumi Railway, a third-sector operator in Chiba Prefecture, held its first formal review meeting on May 27 to decide the future of its 26.8-kilometer line. A derailment in October 2024 caused by rotted wooden railroad ties forced a complete shutdown. The railway now faces three options: full restoration, complete closure, or operating only the profitable eastern section. A decision will come by 2027.

The Derailment and Current Shutdown

A two-car train derailed in October 2024 in Isumi City due to decayed and cracked wooden sleepers. No passengers were injured. The accident triggered a full line closure that continues today. Substitute bus service now handles all passenger transport on the 26.8-kilometer route between Ōhara and Kaminaka stations.

Repair Costs Block Restoration Plans

The eastern section (Ōhara to Ōtaki, 15.8 kilometers) serves 80% of riders and costs approximately 10 billion yen to repair. Work is underway with a target restart in autumn 2027. The western section (Ōtaki to Kaminaka, 10.8 kilometers) requires an additional 10 billion yen for repairs. Total system maintenance over 10 years would cost roughly 50 billion yen, pushing total expenses to 70 billion yen.

Three Paths Forward Under Review

Officials will evaluate three scenarios: full line restoration, complete closure, or keeping only the eastern section and converting the western section to bus service. The review committee includes Chiba Prefecture, four local municipalities, railway staff, and transportation experts. The initial meeting confirmed no predetermined outcome, with discussions to include local demand surveys and economic impact analysis.

Timeline and Decision Process

The committee will hold approximately three meetings in fiscal 2026 and five total meetings through 2027. Final recommendations will be delivered in fiscal 2027. The review chair stated the committee will compare all options without bias and avoid treating any choice as taboo.

Final Thoughts

Isumi Railway’s future hinges on whether repair costs justify service restoration. With 70 billion yen in total expenses and weak ridership on the western section, closure or partial operation appears likely by 2027.

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