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Between October 21 and 23, 2024, the Yamaguchi District Transport Bureau conducted a safety audit of Nishikigawa Railway Co., Ltd. The audit revealed that, contrary to previous instructions, some structural change records for tunnel facilities were not properly preserved to allow for the tracking of structural changes, as mandated by Article 44 of the Railway Technical Standards Ordinance. The company was instructed to reconsider their record-keeping practices, establish a management system to maintain continuous records, and report the corrective measures by February 5, 2025.

Between October 26 and 29, 2021, a safety audit was conducted on Nishikawa Railway Co., Ltd. (corporate number 4250001011769) headquartered in Iwakuni City, Yamaguchi Prefecture. The audit revealed several areas requiring improvement, including: (1) verifying staff qualifications before assigning train operation tasks; (2) conducting and distinguishing between regular and special tunnel inspections within the required intervals; (3) properly recording and preserving structural change histories of facilities such as bridges and tunnels; (4) ensuring ATS equipment inspections are fully carried out and records are consistent with standards; (5) providing necessary training and verifying staff competencies for train operation tasks; and (6) complying with procedures for changes in railway facilities, such as cable installation methods, under the Railway Business Act. The company is instructed to take corrective actions and report back by May 2, 2022.