Enforcement record

Administrative Guidance against 大井川鐵道株式会社

大井川鐵道株式会社 (Railway Business Act)

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Railway Business ActConfirmed entity match4 August 2022

Action type

Administrative Guidance

Law

Railway Business Act

Authority

Action date

4 August 2022

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-422CA1A2-34F3-4A2-202607241347
Generated at: 24 July 2026 at 22:47
Record URL: https://regbase.jp/en/enforcement/422ca1a2-34f3-4a26-9818-fa48f7108024

1. Review Summary

Target entity	大井川鐵道株式会社	Corporate Number	1080001013422
Enforcement record	1 record	Other confirmed records for this company	5 records
Action date	4 August 2022	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	大井川鐵道株式会社
Original Japanese name	大井川鐵道株式会社
English-name source	Japanese original
Corporate Number	1080001013422
Company status	Active
Representative	Not recorded
Registered address	静岡県島田市金谷東２丁目１１１２番地の２
Industry / capital	Industry: 鉄道事業者 / Capital: -

3. Enforcement Record

Target name in disclosure	大井川鐵道株式会社
Authority	()
Law / action type	Railway Business Act / Administrative Guidance
Action / announcement date	Action: 4 August 2022 / Announcement: 10 July 2026
English summary	On May 21, 2022, an incident occurred where a falling concrete fragment inside the First Kamekubo Tunnel, between Kanzo Station and Ikawa Station on the Ikawa Line, impacted a train. The company reported that the latest regular inspection results indicated a health grade of S. Due to concerns about tunnel maintenance and management, an audit was conducted on June 8-10, 2022, which found the need for improvements. The company was instructed to verify the current handling of tunnels and other railway facilities, revise inspection standards appropriately, and ensure proper condition assessments and facility management. The company must also implement necessary staff education and training, review internal management systems, and report on measures taken by September 5, 2022. Specific issues identified include the use of inspection standards not aligned with the 'Maintenance Management Standards' for railway structures, discrepancies in condition assessments, and lack of proper inspections for falling debris and individual structural evaluations. The company is required to address these issues to ensure safety and compliance with the Railway Technical Standards Ordinance.
Original Japanese text	令和４年５月２１日に井川線閑蔵駅～井川駅間の第１亀久保トンネル内において、落下したコンクリート片に列車が衝撃した事象が発生し、その際、貴社から当該トンネルにおける直近の定期検査結果の健全度はＳ判定であったとの報告があった。これを受けて、貴社のトンネルの維持管理状況に疑義が生じたことから、貴社に対して、令和４年６月８日、９日及び１０日に保安監査を実施したところ、下記のとおり改善を要する事項が認められたことから、所要の措置を講ずるよう指示する。改善措置を講ずるにあたっては、当該事項に係る業務の実施方法、実施状況、管理方法等の妥当性について検証するなど、背後要因を含めて当該事項が発生した原因を究明したうえで、再発防止に必要な改善策を策定するとともに、法令に基づく検査の実施等、輸送の安全に係る業務が確実に実施できるよう留意すること。なお、講じた措置については、令和４年９月５日までに報告されたい。記１．実施基準（土木編）第４１条第４項に規定するトンネルの定期検査について、「トンネルの保守管理マニュアル」に基づき検査を実施すると規定している。しかしながら、貴社の実態は、同マニュアルには規定されていない維持管理計画、構造物の要求性能及び措置などが追記された「鉄道構造物等維持管理標準」（以下「維持管理標準」という。）に基づき検査を実施しており、適切に実施基準を変更していないことを確認した。よって、トンネル及びトンネル以外の鉄道施設についても現状の取扱いを検証し、適切に同実施基準を見直すこと。なお、同実施基準の見直しにあたっては、法令に基づく所要の手続きを行うこと。２．同実施基準第４１条第４項に規定するトンネルの定期検査について、令和３年に実施した特別全般検査の点検作業等は外注業者に委託しており、外注業者が判定した検査結果のうち第１亀久保トンネルの健全度はＳ判定であった。しかしながら、令和元年に貴社が実施した通常全般検査の検査結果のうち当該トンネルの健全度はＢ判定であったことから、書類及び現地を確認したところクラック等が発生しており、維持管理標準に基づく健全度はＳ判定とはならないことを確認した。また、外注業者による健全度の判定区分と、貴社が規定する健全度の判定区分に差異があるにもかかわらず、貴社において健全度の判定を実施しておらず、適切に施設を管理していないことを確認した。よって、維持管理標準に基づき、トンネルの健全度の判定を確実に実施するとともに、適切に施設を管理すること。３．同実施基準第４１条第４項に規定するトンネルの定期検査について、令和元年度に実施した通常全般検査及び令和３年に実施した特別全般検査で、はく落に関する健全度の判定を実施しておらず、適切に施設を管理していないことを確認した。よって、維持管理標準に基づき、はく落に関する健全度の判定を確実に実施するとともに、適切に施設を管理すること。４．同実施基準第４１条第４項に規定するトンネルの定期検査について、令和元年度に実施した通常全般検査で健全度をＡ判定とした箇所において、個別検査を実施していないことを確認した。よって、維持管理標準に基づき、個別検査を確実に実施すること。５．上記の指示内容を確実に実施するため、管理者及び施設係員に対し必要な教育及び訓練を実施するとともに、社内の管理体制を検証し、その体制を見直すこと。【中部運輸局】
Official source	https://www.mlit.go.jp/nega-inf/cgi-bin/search.cgi?jigyoubunya=tetudou&EID=search&no=31
Source archive	https://kiroku.today/a/9e70ecef60f9v2vk
Extraction / evidence timestamps	Extracted: 17 July 2026 at 18:24 / Evidence checked: 17 July 2026 at 18:24 / Archive captured: 11 July 2026 at 03:34

4. Business Location and Permit Details

Business location address	静岡県島田市
Legal articles	鉄道に関する技術上の基準を定める省令
Overview page	https://www.mlit.go.jp/nega-inf/cgi-bin/search.cgi?jigyoubunya=tetudou&EID=search&no=31

5. Other Confirmed Records for This Company

1. 31 March 2026 Administrative Guidance

Company	大井川鐵道株式会社
Law	Railway Business Act
Summary	Between October 14-16 and November 4-6, 2025, the Shizuoka District Transport Bureau conducted a safety audit of Oigawa Railway Co., Ltd. (corporate number 1080001013422), headquartered in Shimada City, Shizuoka Prefecture. The audit revealed several issues requiring improvement, including: 1. Railway facilities such as the easing curve between Kanaya Station and Ieyama Station, retaining wall near 0.8 km mark between Kanaya and Shin-Kanaya stations, and the platform canopy at Ieyama Station do not match construction plans. The company is instructed to undertake procedures under Article 12 of the Railway Business Act, improve staff training and internal verification systems, and report measures by May 1, 2026. 2. Regular inspections per Article 41 of the Civil Engineering Standards (Implementation Standards) revealed that: - Divergence in switch track alignment exceeding standards was not corrected. - Excessive clearance in track gauge was not addressed. - Platform at Kawane Onsen Sasamada Station was not repaired despite obstructing the building limit. The company must promptly carry out necessary maintenance, ensure proper facility management, and establish a system for compliance. 3. Some sideline tracks at Shin-Kanaya Station were not inspected for track misalignment, rail condition, or switch devices. The company must ensure regular inspections or cease use as appropriate. 4. Tunnel assessments classified as 'AA' and 'A1' were confirmed to be in stable condition after on-site checks, and no restrictions on use are necessary. The company should re-evaluate all tunnels and establish proper maintenance systems. 5. The recurrence prevention measures for a train separation incident on January 30, 2010, have not been properly implemented. The company must take necessary actions to prevent future incidents. 6. Changes made on September 3, 2010, to vehicle standards regarding inspection items for coupling devices were not reflected in current management, and inspections have not been conducted. The standards must be properly managed and inspections enforced. 7. Some onboard equipment, such as displays of station names and operational info on 6000 series trains, was found malfunctioning. Corrective measures are required. 8. Inspections of train vehicles revealed missing or incomplete checks on electrical equipment, bogies, and couplings. The company must organize and perform all necessary inspections. 9. The height of couplers during comprehensive vehicle inspections was not verified against design specifications, impairing inspection accuracy. The company must ensure proper verification and establish a suitable inspection system. The company is instructed to investigate root causes, implement corrective actions, and report by May 1, 2026, to ensure ongoing safety and compliance.
RegBase URL	https://regbase.jp/en/enforcement/tetsudo-jigyoho-da-jing-chuan-tie-dao-20260331

2. 31 March 2026 Administrative Guidance

Company	大井川鐵道株式会社
Law	Railway Business Act
Summary	Between October 14-16 and November 4-6, 2025, the Shizuoka District Transport Bureau conducted a safety audit of Oigawa Railway Co., Ltd. (corporate number 1080001013422), headquartered in Shimada City, Shizuoka Prefecture. The audit revealed several issues requiring corrective action, including: 1) discrepancies between existing railway facilities and construction plans, such as the insertion of easing curves between Kanaya and Ieyama stations, retaining walls near 0.8 km mark, and station platform roofing; 2) failure to perform required periodic inspections under the civil engineering standards, including track gauge, elevation, and turnout inspections, with specific deficiencies in maintaining standards for switch track alignment, clearance, and platform safety at Kawane Onsen Sasamado Station; 3) lack of inspections on some sideline tracks at Shin-Kanaya Station; 4) incorrect assessment of tunnel conditions, with some tunnels judged as safe despite signs of deterioration; 5) failure to implement measures to prevent train separation incidents that occurred on January 30, 2010; 6) omission of inspection items for coupling devices on vehicles, including recent management lapses; 7) malfunctioning of display equipment on 6000 series trains; 8) incomplete inspections of train vehicles, including electrical equipment and mechanical parts; and 9) lack of proper measurement of coupler heights across vehicle types, affecting safety checks. The company is instructed to investigate root causes, take necessary corrective actions, improve staff training, and submit a report by May 1, 2026, including measures to prevent recurrence and ensure ongoing compliance with railway safety standards.
RegBase URL	https://regbase.jp/en/enforcement/a0d7db66-c426-4f7b-9da8-aa48c4e29af0

3. 25 March 2025 Administrative Guidance

Company	大井川鐵道株式会社
Law	Railway Business Act
Summary	Between October 7 and 9, 2024, the Shizuoka Prefectural Transport Bureau conducted a safety audit of Oigawa Railway Co., Ltd. The audit revealed that the company had not conducted inspections of track material wear during switch inspections as required by Article 41 of the Civil Engineering Standards for Track Inspection. Additionally, it was confirmed that the E34 electric locomotive exceeded the inspection cycle stipulated in the Standards for State Function Inspection under Article 36 of the Vehicle Standards. The bureau instructed the company to implement necessary corrective actions, including education, training, and establishing a system to properly monitor inspection status, and to ensure regular and proper vehicle inspections. The company must report the measures taken by April 25, 2025.
RegBase URL	https://regbase.jp/en/enforcement/8d10820d-47e4-473d-8e53-57e12ce956bf

4. 25 March 2025 Administrative Guidance

Company	大井川鐵道株式会社
Law	Railway Business Act
Summary	Between October 7 and 9, 2024, the Chubu Transportation Bureau conducted a safety audit of Oigawa Railway Co., Ltd. (corporate number 1080001013422) headquartered in Shimada City, Shizuoka Prefecture. The audit revealed that the company did not perform inspections of track material wear during switch inspections as required by Article 41 of the Civil Engineering Standards for Track Inspection. Additionally, the company exceeded the inspection cycle for the E34 electric locomotive as specified in Article 36 of the Vehicle Standards. Based on these findings, the bureau has issued administrative guidance, instructing the company to investigate the root causes, implement preventive measures, and report the actions taken by April 25, 2025. The company must ensure proper training, establish systems to monitor inspection compliance, and take necessary corrective actions to ensure safety standards are met.
RegBase URL	https://regbase.jp/en/enforcement/tetsudo-jigyoho-da-jing-chuan-tie-dao-20250325

5. 3 July 2023 Administrative Guidance

Company	大井川鐵道株式会社
Law	Railway Business Act
Summary	Between May 9 and May 12, 2023, the Chubu Transportation Bureau conducted safety audits of Oigawa Railway Co., Ltd. (corporate number 1080001013422), headquartered in Shimada City, Shizuoka Prefecture. The audit revealed that the company had not conducted regular inspections of the overpasses, joint plates, track beds, platforms, and drainage channels on the Oigawa Main Line and Ikawa Line as required by the Civil Engineering Standards Article 41, and that inspection items for overpass structures were not specified in the Building Inspection Standards Article 6. The company was instructed to promptly carry out necessary inspections, revise relevant regulations to ensure regular inspections are reliably conducted, and to educate and train staff responsible for inspections to establish a system for monitoring inspection implementation. Additionally, at the Kadoide Station platform, it was confirmed that the building clearance specified in the Civil Engineering Standards Article 19 was obstructed, despite awareness of this issue. The company was instructed to take immediate corrective actions based on Standards Article 19 and the Building Maintenance Guidelines Article 11, and to ensure proper maintenance and management of railway facilities in compliance with applicable laws and standards, establishing a system for appropriate facility maintenance and management.
RegBase URL	https://regbase.jp/en/enforcement/c45bd815-7da8-489b-aa8a-d22a77afd5fa

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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Action summary

Company: 大井川鐵道株式会社Japanese original
Original: 大井川鐵道株式会社
Corporate Number: 1080001013422
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: 4 August 2022
Issuing authority
Industry context: 鉄道事業者

Violation

Machine-translated summary — verify against original

On May 21, 2022, an incident occurred where a falling concrete fragment inside the First Kamekubo Tunnel, between Kanzo Station and Ikawa Station on the Ikawa Line, impacted a train. The company reported that the latest regular inspection results indicated a health grade of S. Due to concerns about tunnel maintenance and management, an audit was conducted on June 8-10, 2022, which found the need for improvements. The company was instructed to verify the current handling of tunnels and other railway facilities, revise inspection standards appropriately, and ensure proper condition assessments and facility management. The company must also implement necessary staff education and training, review internal management systems, and report on measures taken by September 5, 2022. Specific issues identified include the use of inspection standards not aligned with the 'Maintenance Management Standards' for railway structures, discrepancies in condition assessments, and lack of proper inspections for falling debris and individual structural evaluations. The company is required to address these issues to ensure safety and compliance with the Railway Technical Standards Ordinance.

Show original Japanese text

令和４年５月２１日に井川線閑蔵駅～井川駅間の第１亀久保トンネル内において、落下したコンクリート片に列車が衝撃した事象が発生し、その際、貴社から当該トンネルにおける直近の定期検査結果の健全度はＳ判定であったとの報告があった。これを受けて、貴社のトンネルの維持管理状況に疑義が生じたことから、貴社に対して、令和４年６月８日、９日及び１０日に保安監査を実施したところ、下記のとおり改善を要する事項が認められたことから、所要の措置を講ずるよう指示する。改善措置を講ずるにあたっては、当該事項に係る業務の実施方法、実施状況、管理方法等の妥当性について検証するなど、背後要因を含めて当該事項が発生した原因を究明したうえで、再発防止に必要な改善策を策定するとともに、法令に基づく検査の実施等、輸送の安全に係る業務が確実に実施できるよう留意すること。なお、講じた措置については、令和４年９月５日までに報告されたい。記１．実施基準（土木編）第４１条第４項に規定するトンネルの定期検査について、「トンネルの保守管理マニュアル」に基づき検査を実施すると規定している。しかしながら、貴社の実態は、同マニュアルには規定されていない維持管理計画、構造物の要求性能及び措置などが追記された「鉄道構造物等維持管理標準」（以下「維持管理標準」という。）に基づき検査を実施しており、適切に実施基準を変更していないことを確認した。よって、トンネル及びトンネル以外の鉄道施設についても現状の取扱いを検証し、適切に同実施基準を見直すこと。なお、同実施基準の見直しにあたっては、法令に基づく所要の手続きを行うこと。２．同実施基準第４１条第４項に規定するトンネルの定期検査について、令和３年に実施した特別全般検査の点検作業等は外注業者に委託しており、外注業者が判定した検査結果のうち第１亀久保トンネルの健全度はＳ判定であった。しかしながら、令和元年に貴社が実施した通常全般検査の検査結果のうち当該トンネルの健全度はＢ判定であったことから、書類及び現地を確認したところクラック等が発生しており、維持管理標準に基づく健全度はＳ判定とはならないことを確認した。また、外注業者による健全度の判定区分と、貴社が規定する健全度の判定区分に差異があるにもかかわらず、貴社において健全度の判定を実施しておらず、適切に施設を管理していないことを確認した。よって、維持管理標準に基づき、トンネルの健全度の判定を確実に実施するとともに、適切に施設を管理すること。３．同実施基準第４１条第４項に規定するトンネルの定期検査について、令和元年度に実施した通常全般検査及び令和３年に実施した特別全般検査で、はく落に関する健全度の判定を実施しておらず、適切に施設を管理していないことを確認した。よって、維持管理標準に基づき、はく落に関する健全度の判定を確実に実施するとともに、適切に施設を管理すること。４．同実施基準第４１条第４項に規定するトンネルの定期検査について、令和元年度に実施した通常全般検査で健全度をＡ判定とした箇所において、個別検査を実施していないことを確認した。よって、維持管理標準に基づき、個別検査を確実に実施すること。５．上記の指示内容を確実に実施するため、管理者及び施設係員に対し必要な教育及び訓練を実施するとともに、社内の管理体制を検証し、その体制を見直すこと。【中部運輸局】

Business location and permit details

Business location address: 静岡県島田市
Legal articles: 鉄道に関する技術上の基準を定める省令
Overview page: https://www.mlit.go.jp/nega-inf/cgi-bin/search.cgi?jigyoubunya=tetudou&EID=search&no=31

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: 2026-07-17T09:24:19.146+00:00
Evidence checked: 2026-07-17T09:24:19.078+00:00
Archive captured: 2026-07-10T18:34:30.042494+00:00

Show audit JSON

{
  "record": {
    "id": "422ca1a2-34f3-4a26-9818-fa48f7108024",
    "url": "https://regbase.jp/en/enforcement/422ca1a2-34f3-4a26-9818-fa48f7108024",
    "company_name_original": "大井川鐵道株式会社",
    "company_name_registry": "大井川鐵道株式会社",
    "corporate_number": "1080001013422",
    "law": {
      "ja": "鉄道事業法",
      "en": "Railway Business Act"
    },
    "action_type": {
      "ja": "行政指導",
      "en": "Administrative Guidance"
    },
    "authority": {
      "ja": "",
      "en": ""
    }
  },
  "entity_match": {
    "status": "confirmed",
    "confidence": 100,
    "method": "source_corporate_number_nta_current_name",
    "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）。"
  },
  "review": {
    "status": "machine_reviewed",
    "label": "Machine checked"
  },
  "compliance_context": {
    "severity": "Low-medium",
    "actionMeaning": "Administrative guidance or supervision was publicly disclosed by the authority.",
    "practicalNote": "Use as a monitoring signal. Confirm details before treating it as a formal sanction.",
    "lawContext": "Japanese regulatory disclosure under Railway Business Act."
  },
  "evidence": {
    "recordUrl": "https://regbase.jp/en/enforcement/422ca1a2-34f3-4a26-9818-fa48f7108024",
    "officialSourceUrl": "https://www.mlit.go.jp/nega-inf/cgi-bin/search.cgi?jigyoubunya=tetudou&EID=search&no=31",
    "officialDocumentUrl": null,
    "archiveUrl": "https://kiroku.today/a/9e70ecef60f9v2vk",
    "archivedSourceUrl": "https://www.mlit.go.jp/nega-inf/cgi-bin/search.cgi?jigyoubunya=tetudou&EID=search&no=31",
    "archiveCapturedAt": "2026-07-10T18:34:30.042494+00:00",
    "extractedAt": "2026-07-17T09:24:19.146+00:00",
    "translatedAt": "2026-07-10T13:31:02.879+00:00",
    "evidenceCheckedAt": "2026-07-17T09:24:19.078+00:00",
    "generatedAt": "2026-07-24T13:47:19.744Z"
  },
  "limitations": [
    "RegBase aggregates public Japanese government disclosures and does not provide a credit opinion.",
    "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."
  ]
}

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: 大井川鐵道株式会社 Japanese original
Japanese name: 大井川鐵道株式会社
Corporate Number: 1080001013422
Registered address: 静岡県島田市金谷東２丁目１１１２番地の２

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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.