- 2024.04.01.
- A transit safe management target and achievement circumstances were renewed.
- 2024.03.24
- Renewal of ISO 14001 was carried out. （Time limit April 24, 2027.）
- 2023.12.15
- Renewal of a safety superior place-of-business certificate (Long term safety certification Gold G mark) was carried out. (Term December 31, 2027)
- 2023.04.01
- A transit safe management target and achievement circumstances were renewed.
- 2022.04.01
- A transit safe management target and achievement circumstances were renewed.
