Enforcement record

Administrative Guidance against 土佐くろしお鉄道株式会社

土佐くろしお鉄道株式会社 (Railway Business Act)

This page is one enforcement record linked to a confirmed legal entity. Company-level Official Gazette notices, registry data, related-company signals, and other public records are collected on the company profile.

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Railway Business ActConfirmed entity match9 June 2023

Action type

Administrative Guidance

Law

Railway Business Act

Authority

Action date

9 June 2023

RegBase evidence report

Japanese public-record enforcement check

Saveable record of the confirmed target entity, regulator disclosure, source status, and review notes for internal compliance files.

Report ID: RB-EN-ENFORCEMENT-592BA221-6F78-4F7-202607250404
Generated at: 25 July 2026 at 13:04
Record URL: https://regbase.jp/en/enforcement/592ba221-6f78-4f7b-9456-d01716affb00

1. Review Summary

Target entity	土佐くろしお鉄道株式会社	Corporate Number	9490001001543
Enforcement record	1 record	Other confirmed records for this company	1 records
Action date	9 June 2023	Authority
Law	Railway Business Act	Action type	Administrative Guidance
Source status	Preserved public-source archive recorded

This report summarizes public Japanese government disclosure data held by RegBase. It is not a credit score, sanctions conclusion, legal opinion, or adverse-media determination. Confirm important decisions against the linked official Japanese source.

2. Target Entity

English display name	土佐くろしお鉄道株式会社
Original Japanese name	土佐くろしお鉄道株式会社
English-name source	Japanese original
Corporate Number	9490001001543
Company status	Active
Representative	Not recorded
Registered address	高知県高知市丸ノ内１丁目２番２０号
Industry / capital	Industry: 鉄道事業者 / Capital: -

3. Enforcement Record

Target name in disclosure	土佐くろしお鉄道株式会社
Authority	()
Law / action type	Railway Business Act / Administrative Guidance
Action / announcement date	Action: 9 June 2023 / Announcement: 10 July 2026
English summary	The incident involved a train derailment on June 2, 2023, between Tosa-Shirahama Station and Arai River Station on the Nakamura Line, caused by landslides from slopes due to rainfall. Despite prior guidance issued on June 1, 2023, to monitor rainfall and weather conditions and to enforce appropriate operational restrictions, the train was operated at normal speed near the landslide site, resulting in derailment. The site was within a designated regulation zone for slope collapse during rain, but the rain gauge alarm system was not properly monitored. Contributing factors included the train being the last service of the day, the staff being preoccupied with arrangements to cease operations, and the station master responsible for issuing operational restrictions being away from the rain gauge monitoring room. Fortunately, all passengers had disembarked before the incident, but it posed a risk of injury. The company has resumed operations with emergency measures such as slow speed near the site and has been warned to continue thorough safety measures, investigate underlying causes, review operational regulations and systems, and implement permanent slope countermeasures promptly. The company is also instructed to report the measures taken in writing. This guidance was issued by the Shikoku Transport Bureau.
Original Japanese text	鉄道の輸送の安全の確保については、機会あるごとに注意喚起してきたところであり、令和5年6月1日付事務連絡「梅雨前線による大雨及び台風第２号に備えた安全輸送の確保について」にて、沿線の降雨状況の把握に努め、気象状況等を適確に判断しつつ、施設等への被害が予想される場合には、適切に運転規制を行うなど事前の対応に万全を期すよう指導したところであるが、6月2日中村線土佐白浜駅から有井川駅間において、斜面から流入した土砂に列車が乗り上げる列車脱線事故を発生させたことは誠に遺憾である。本件事故については、現在、運輸安全委員会において原因調査中であるが、土砂が流入し、脱線事故が発生した現場は、災害時の運転規制手続きを定める社内規程「災害時運転規制手続」において、降雨時の斜面崩壊に対し設定された規制区間内に位置しているが、当該社内規程に基づく雨量計警報装置の監視が適切に行われなかったことが要因のひとつであると考えられる。雨量計警報装置の監視が適切に行えなかったのは、当該列車を最終列車とし、以後の運転を中止するための手配に追われ、雨量計警報装置への注意を欠いていたこと、また運転規制を要請する施設車両区長が、打合せのため雨量計警報装置が設置された執務室を離れていため、結果的に当該区間を規制する雨量計の雨量が運転中止の値に達していたにも関わらず、当該列車は、現場付近を通常の速度で走行し脱線している。本件事故は、幸い乗客が全て下車した後に発生したが、一歩間違えば多くの負傷者が生ずる恐れのある事態であった。現場最徐行等の緊急対策を講じた上で運転を再開するとしているところであるが、多雨期を迎えていることを踏まえ、引き続き、万全の対応を継続するとともに、同種事故防止のため、背後要因を含む原因を究明のうえ、適切な運転規制を行えるよう運転規制に係る規程や実施体制の見直しを行うとともに、現場斜面の恒久対策の検討を速やかに行うよう厳重に警告する。なお、講じた措置については、文書により速やかに報告されたい。【四国運輸局】
Official source	https://www.mlit.go.jp/nega-inf/cgi-bin/search.cgi?jigyoubunya=tetudou&EID=search&no=86
Source archive	https://kiroku.today/a/8377ba9bb7fzkpzu
Extraction / evidence timestamps	Extracted: 17 July 2026 at 18:23 / Evidence checked: 17 July 2026 at 18:23 / Archive captured: 11 July 2026 at 15:33

4. Business Location and Permit Details

Business location address	高知県高知市
Legal articles	鉄道事業法
Overview page	https://www.mlit.go.jp/nega-inf/cgi-bin/search.cgi?jigyoubunya=tetudou&EID=search&no=86

5. Other Confirmed Records for This Company

1. 22 December 2023 Administrative Guidance

Company	土佐くろしお鉄道株式会社
Law	Railway Business Act
Summary	Between October 3 and 6, 2023, a safety audit was conducted on Tosa Kuroshio Railway Co., Ltd. The audit revealed multiple issues requiring improvement. Specifically, driver-related personnel did not perform temporary driver suitability inspections (attention distribution tests) as mandated by Article 10 of the operational standards management regulations. Additionally, electrical staff did not receive new employee training as specified in the training regulations, and the annual training plans and results were not reported to the General Affairs Manager as required. The company must promptly conduct the overdue inspections and training, and review its training and management systems to ensure proper implementation. Furthermore, the periodic inspection of automatic train stop devices, as stipulated in Article 79 of the safety equipment implementation standards, was not performed despite the Q-values falling below standard. Repairs must be promptly carried out, and maintenance management systems should be improved. Inspections of crossing alarms at Nakakado crossing, including measurement of control section length, were not conducted. These must be performed immediately, and inspection systems should be enhanced to ensure regular and thorough inspections. Lastly, the voltage measurement results of signal lamps at Kubokawa Station were not recorded during routine inspections as required. Records must be maintained accurately, and inspection management systems should be improved. The company is instructed to investigate the root causes of these deficiencies, implement corrective actions, and report the measures taken by January 29, 2024.
RegBase URL	https://regbase.jp/en/enforcement/f55f994c-66cc-4805-9617-acd5fe8fe8d5

Reviewer Notes

Reviewer		Team / company
Review purpose
Additional notes

□ Official source URL or archived source was checked.
□ Corporate Number, address, or other identifiers were reviewed to avoid confusing similarly named entities.
□ This document is understood as a public-record evidence file, not a credit decision or legal opinion.

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/api/v1/enforcements?corporate_number=9490001001543&limit=10

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Action summary

Company: 土佐くろしお鉄道株式会社Japanese original
Original: 土佐くろしお鉄道株式会社
Corporate Number: 9490001001543
Entity match: Confirmed entity match100/100Machine checked
source_corporate_number_nta_current_name
国税庁法人番号データとの独立照合で対象法人を確認しました（source_corporate_number_nta_current_name）。
Governing law: Railway Business Act
鉄道事業法
Action type: Administrative Guidance
行政指導
Action date: 9 June 2023
Issuing authority
Industry context: 鉄道事業者

Violation

Machine-translated summary — verify against original

The incident involved a train derailment on June 2, 2023, between Tosa-Shirahama Station and Arai River Station on the Nakamura Line, caused by landslides from slopes due to rainfall. Despite prior guidance issued on June 1, 2023, to monitor rainfall and weather conditions and to enforce appropriate operational restrictions, the train was operated at normal speed near the landslide site, resulting in derailment. The site was within a designated regulation zone for slope collapse during rain, but the rain gauge alarm system was not properly monitored. Contributing factors included the train being the last service of the day, the staff being preoccupied with arrangements to cease operations, and the station master responsible for issuing operational restrictions being away from the rain gauge monitoring room. Fortunately, all passengers had disembarked before the incident, but it posed a risk of injury. The company has resumed operations with emergency measures such as slow speed near the site and has been warned to continue thorough safety measures, investigate underlying causes, review operational regulations and systems, and implement permanent slope countermeasures promptly. The company is also instructed to report the measures taken in writing. This guidance was issued by the Shikoku Transport Bureau.

Show original Japanese text

鉄道の輸送の安全の確保については、機会あるごとに注意喚起してきたところであり、令和5年6月1日付事務連絡「梅雨前線による大雨及び台風第２号に備えた安全輸送の確保について」にて、沿線の降雨状況の把握に努め、気象状況等を適確に判断しつつ、施設等への被害が予想される場合には、適切に運転規制を行うなど事前の対応に万全を期すよう指導したところであるが、6月2日中村線土佐白浜駅から有井川駅間において、斜面から流入した土砂に列車が乗り上げる列車脱線事故を発生させたことは誠に遺憾である。本件事故については、現在、運輸安全委員会において原因調査中であるが、土砂が流入し、脱線事故が発生した現場は、災害時の運転規制手続きを定める社内規程「災害時運転規制手続」において、降雨時の斜面崩壊に対し設定された規制区間内に位置しているが、当該社内規程に基づく雨量計警報装置の監視が適切に行われなかったことが要因のひとつであると考えられる。雨量計警報装置の監視が適切に行えなかったのは、当該列車を最終列車とし、以後の運転を中止するための手配に追われ、雨量計警報装置への注意を欠いていたこと、また運転規制を要請する施設車両区長が、打合せのため雨量計警報装置が設置された執務室を離れていため、結果的に当該区間を規制する雨量計の雨量が運転中止の値に達していたにも関わらず、当該列車は、現場付近を通常の速度で走行し脱線している。本件事故は、幸い乗客が全て下車した後に発生したが、一歩間違えば多くの負傷者が生ずる恐れのある事態であった。現場最徐行等の緊急対策を講じた上で運転を再開するとしているところであるが、多雨期を迎えていることを踏まえ、引き続き、万全の対応を継続するとともに、同種事故防止のため、背後要因を含む原因を究明のうえ、適切な運転規制を行えるよう運転規制に係る規程や実施体制の見直しを行うとともに、現場斜面の恒久対策の検討を速やかに行うよう厳重に警告する。なお、講じた措置については、文書により速やかに報告されたい。【四国運輸局】

Business location and permit details

Business location address: 高知県高知市
Legal articles: 鉄道事業法
Overview page: https://www.mlit.go.jp/nega-inf/cgi-bin/search.cgi?jigyoubunya=tetudou&EID=search&no=86

These fields are extracted from the original Japanese disclosure or linked overview pages when available.

Compliance context

Low-medium

Administrative guidance or supervision was publicly disclosed by the authority.

Japanese regulatory disclosure under Railway Business Act.

Use as a monitoring signal. Confirm details before treating it as a formal sanction.

This context is an operational aid for review workflows, not a credit opinion or legal conclusion.

Evidence pack

Original source (Japanese)Open preserved source and evidence pack

Extracted at: 2026-07-17T09:23:33.781+00:00
Evidence checked: 2026-07-17T09:23:33.709+00:00
Archive captured: 2026-07-11T06:33:51.395977+00:00

Show audit JSON

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    "company_name_registry": "土佐くろしお鉄道株式会社",
    "corporate_number": "9490001001543",
    "law": {
      "ja": "鉄道事業法",
      "en": "Railway Business Act"
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      "en": ""
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    "method_label": "source_corporate_number_nta_current_name",
    "notes": "国税庁法人番号データとの独立照合で対象法人を確認しました（source_corporate_number_nta_current_name）。"
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  "review": {
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  "compliance_context": {
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    "practicalNote": "Use as a monitoring signal. Confirm details before treating it as a formal sanction.",
    "lawContext": "Japanese regulatory disclosure under Railway Business Act."
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  "evidence": {
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    "officialSourceUrl": "https://www.mlit.go.jp/nega-inf/cgi-bin/search.cgi?jigyoubunya=tetudou&EID=search&no=86",
    "officialDocumentUrl": null,
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    "archiveCapturedAt": "2026-07-11T06:33:51.395977+00:00",
    "extractedAt": "2026-07-17T09:23:33.781+00:00",
    "translatedAt": "2026-07-10T13:20:58.287+00:00",
    "evidenceCheckedAt": "2026-07-17T09:23:33.709+00:00",
    "generatedAt": "2026-07-25T04:04:42.250Z"
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  "limitations": [
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    "English summaries are provided for reference. The original Japanese source is authoritative.",
    "Possible or unresolved entity matches should be manually verified before use in a decision."
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The original Japanese disclosure is the authoritative record. Use possible or unresolved matches only as leads for manual review.

Language

日本語版を見る (Japanese)

Company info

English name: 土佐くろしお鉄道株式会社 Japanese original
Japanese name: 土佐くろしお鉄道株式会社
Corporate Number: 9490001001543
Registered address: 高知県高知市丸ノ内１丁目２番２０号

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Other confirmed records for this company

Administrative Guidance22 Dec 2023
The company, Tosa Kuroshio Railway Co., Ltd., was subject to administrative guidance following a safety audit conducted from October 3 to 6, 2023. The audit identified several deficiencies in operational safety procedures, including failure to conduct certain driver suitability tests, inadequate training for electrical staff, and lapses in maintenance and inspection of safety equipment such as automatic train stop devices, crossing alarms, and signal lights. The company is instructed to implement corrective measures, investigate root causes, and report by January 29, 2024.

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About this recordAggregated and translated from public Japanese government disclosures. The English text is for reference only — authoritative content is the linked Japanese source.