Announced details
Infrastructure maintenance for aging bridges, factories and other facilities; roof repairs at railway rolling stock maintenance depots
Estimated construction period: 4 years or less. At another site, the temperature beneath the slate roof during summer fell by up to 20 degrees compared with before construction after the SOSEI method was applied.
The SOSEI roof-repair method, developed and implemented by the Company, was introduced at a media tour held at East Japan Railway Company's Akita General Rolling Stock Base. Details of the capital, personnel and contractual relationships are not disclosed.
Head office: Shibuya-ku, Tokyo. East Japan Railway Company's Akita Business Headquarters Akita General Rolling Stock Base (Minami-Akita) is located in Akita, Akita Prefecture, and is a key facility supporting the safe and reliable operation of Japan's railways. Details of its capital, year of establishment, representative and business activities are not disclosed.
Akita, Akita Prefecture (East Japan Railway Company's Akita Business Headquarters Akita General Rolling Stock Base (Minami-Akita))
The Company states that it will continue its efforts to help curb the costs of measures to address aging infrastructure at East Japan Railway Company, but the specific impact of this matter on sales and profit is not disclosed.
The company does not address Contract Value / Offering price.
TOYOKOH Inc., “Matters Concerning Business Plans and Growth Potential” (published 19 June 2026), p. 36
| Item | Details |
|---|---|
| Names of Products / Services Covered | SOSEI roof-repair method |
| Counterparty | East Japan Railway Company (JR East) |
| Counterparty overview | Head office: Shibuya-ku, Tokyo. East Japan Railway Company's Akita Business Headquarters Akita General Rolling Stock Base (Minami-Akita) is located in Akita, Akita Prefecture, and is a key facility supporting the safe and reliable operation of Japan's railways. Details of its capital, year of establishment, representative and business activities are not disclosed. |
| Relationship with the Company | The SOSEI roof-repair method, developed and implemented by the Company, was introduced at a media tour held at East Japan Railway Company's Akita General Rolling Stock Base. Details of the capital, personnel and contractual relationships are not disclosed. |
| Launch date | not disclosed (the media tour had been held by 19 August 2026) |
| Applicable area | Infrastructure maintenance for aging bridges, factories and other facilities; roof repairs at railway rolling stock maintenance depots |
| Location | Akita, Akita Prefecture (East Japan Railway Company's Akita Business Headquarters Akita General Rolling Stock Base (Minami-Akita)) |
| Location scale | Passenger car depot No. 1 roof area: approximately 12,000 m². Approximately 60 years old. |
| Quantitative Effects | Estimated construction period: 4 years or less. At another site, the temperature beneath the slate roof during summer fell by up to 20 degrees compared with before construction after the SOSEI method was applied. |
| Impact on Business Performance | The Company states that it will continue its efforts to help curb the costs of measures to address aging infrastructure at East Japan Railway Company, but the specific impact of this matter on sales and profit is not disclosed. |
| Source | TOYOKOH Inc., “Matters Concerning Business Plans and Growth Potential” (published 19 June 2026), p. 36 |
Items this document does not state (7)
These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.
The reasons the company gives
The company's own explanation, not something inferred from the numbers.Replacing the roof requires avoiding impacts on inspection and cleaning operations inside the depot, and presents the challenge of requiring a construction period of more than 10 years and enormous costs before completion. It was explained that the SOSEI method allows workers to operate on a highly durable resin layer, enabling large areas to be repaired efficiently without suspending work inside the depot.