{
  "edition": "2026-11-07",
  "id": "doctor-yellow-923",
  "locale": "ja",
  "url": "https://senroam.com/ja/trains/doctor-yellow-923/",
  "name": "923 · Doctor Yellow · T4 / T5",
  "summary": "923 · Doctor Yellow · T4 / T5 · 低い先端と運転台の間に張り出しがあります。",
  "type": "train",
  "questions": [
    {
      "id": "doctor-yellow-923-q1",
      "question": "2025年1月に923形は2編成とも引退した？",
      "answer": "2025年1月29日に最後の検測を終えたのはJR東海のT4編成。以後もJR西日本のT5編成が、新大阪以東の東海道新幹線を含む東京〜博多間を検測してきた。2026年11月7日現在、T5編成の検測運転は2027年1月に終了予定。",
      "evidence": [
        {
          "title": "ドクターイエロー（T4編成）部品オークション・車両解説",
          "url": "https://market.jr-central.co.jp/shop/pages/s983_t4auction.aspx",
          "publisher": "JR東海",
          "lang": "ja",
          "date": null,
          "page": null,
          "checked": "2026-11-07"
        },
        {
          "title": "ドクターイエロー（Ｔ４編成）引退に伴うイベント等の実施について",
          "url": "https://jr-central.co.jp/news/release/_pdf/000043982.pdf",
          "publisher": "JR東海",
          "lang": "ja",
          "date": "2024-12-12",
          "page": 1,
          "checked": "2026-11-07"
        },
        {
          "title": "500系新幹線＆「ドクターイエロー」Ｔ５編成の引退について",
          "url": "https://www.westjr.co.jp/press/article/2026/06/22/items/260622_00_press_500kei_dryellow.pdf",
          "publisher": "JR西日本",
          "lang": "ja",
          "date": "2026-06-22",
          "page": 1,
          "checked": "2026-11-07"
        }
      ],
      "sources": [
        "https://market.jr-central.co.jp/shop/pages/s983_t4auction.aspx",
        "https://jr-central.co.jp/news/release/_pdf/000043982.pdf",
        "https://www.westjr.co.jp/press/article/2026/06/22/items/260622_00_press_500kei_dryellow.pdf"
      ]
    },
    {
      "id": "doctor-yellow-923-q2",
      "question": "T5編成の最終検測日は時刻表で確認できる？",
      "answer": "JR西日本は、イベントを除き、最終運行日を含む検測運転の計画を公表しないとしている。2027年1月は終了予定の月。特定の日や駅で見られるという予告ではない。",
      "evidence": [
        {
          "title": "500系新幹線＆「ドクターイエロー」Ｔ５編成の引退について",
          "url": "https://www.westjr.co.jp/press/article/2026/06/22/items/260622_00_press_500kei_dryellow.pdf",
          "publisher": "JR西日本",
          "lang": "ja",
          "date": "2026-06-22",
          "page": 1,
          "checked": "2026-11-07"
        }
      ],
      "sources": [
        "https://www.westjr.co.jp/press/article/2026/06/22/items/260622_00_press_500kei_dryellow.pdf"
      ]
    },
    {
      "id": "doctor-yellow-923-q3",
      "question": "700系に似た923形で、軌道検測の仕組みはどう変わった？",
      "answer": "旅客用700系をベースに、時速270 kmで検測できるよう開発された。軌道検測車は全長25 mの2台車方式に変更。従来のように三つの台車の位置関係から軌道変位を求める方式に代わり、レーザーを使って測定する。",
      "evidence": [
        {
          "title": "世界に誇る安全な新幹線を守ってきた「ドクターイエロー」の歩みを振り返る",
          "url": "https://www.tetsudo.com/report/481/",
          "publisher": "鉄道コム（栗原景）",
          "lang": "ja",
          "date": "2025-01-26",
          "page": null,
          "checked": "2026-11-07"
        },
        {
          "title": "ドクターイエロー（T4編成）部品オークション・車両解説",
          "url": "https://market.jr-central.co.jp/shop/pages/s983_t4auction.aspx",
          "publisher": "JR東海",
          "lang": "ja",
          "date": null,
          "page": null,
          "checked": "2026-11-07"
        }
      ],
      "sources": [
        "https://www.tetsudo.com/report/481/",
        "https://market.jr-central.co.jp/shop/pages/s983_t4auction.aspx"
      ]
    },
    {
      "id": "doctor-yellow-923-q4",
      "question": "T4編成の屋根にある小さなドームでは何を見ていた？",
      "answer": "3・5号車の観測ドームでは、パンタグラフとトロリ線の様子を走行中に目視できた。観測台のカメラ映像は1号車の電気検測室へ。別系統の4号車は軌道検測室で、軌道変位の波形をその場で画面に表示した。",
      "evidence": [
        {
          "title": "ドクターイエロー（T4編成）部品オークション・車両解説",
          "url": "https://market.jr-central.co.jp/shop/pages/s983_t4auction.aspx",
          "publisher": "JR東海",
          "lang": "ja",
          "date": null,
          "page": null,
          "checked": "2026-11-07"
        }
      ],
      "sources": [
        "https://market.jr-central.co.jp/shop/pages/s983_t4auction.aspx"
      ]
    },
    {
      "id": "doctor-yellow-923-q5",
      "question": "T4編成の写真で製造銘板の社名が違うのはなぜ？",
      "answer": "まず号車を確かめたい。JR東海の資料では1〜3号車が日立製作所、4〜7号車が日本車輌製造。さらに「東海旅客鉄道」の車外銘板が全車に付いていた。同じ1両でも、どの銘板を撮ったかで写真に写る社名が変わる。",
      "evidence": [
        {
          "title": "ドクターイエロー（T4編成）部品オークション・車両解説",
          "url": "https://market.jr-central.co.jp/shop/pages/s983_t4auction.aspx",
          "publisher": "JR東海",
          "lang": "ja",
          "date": null,
          "page": null,
          "checked": "2026-11-07"
        }
      ],
      "sources": [
        "https://market.jr-central.co.jp/shop/pages/s983_t4auction.aspx"
      ]
    }
  ],
  "sources": [
    {
      "url": "https://jr-central.co.jp/news/release/_pdf/000043982.pdf",
      "checked": "2026-11-07",
      "lang": "ja"
    },
    {
      "url": "https://www.westjr.co.jp/press/article/2026/06/22/items/260622_00_press_500kei_dryellow.pdf",
      "checked": "2026-11-07",
      "lang": "ja"
    },
    {
      "title": "ドクターイエロー（T4編成）部品オークション・車両解説",
      "url": "https://market.jr-central.co.jp/shop/pages/s983_t4auction.aspx",
      "publisher": "JR東海",
      "lang": "ja",
      "date": null,
      "page": null,
      "checked": "2026-11-07"
    },
    {
      "title": "ドクターイエロー（Ｔ４編成）引退に伴うイベント等の実施について",
      "url": "https://jr-central.co.jp/news/release/_pdf/000043982.pdf",
      "publisher": "JR東海",
      "lang": "ja",
      "date": "2024-12-12",
      "page": 1,
      "checked": "2026-11-07"
    },
    {
      "title": "500系新幹線＆「ドクターイエロー」Ｔ５編成の引退について",
      "url": "https://www.westjr.co.jp/press/article/2026/06/22/items/260622_00_press_500kei_dryellow.pdf",
      "publisher": "JR西日本",
      "lang": "ja",
      "date": "2026-06-22",
      "page": 1,
      "checked": "2026-11-07"
    },
    {
      "title": "世界に誇る安全な新幹線を守ってきた「ドクターイエロー」の歩みを振り返る",
      "url": "https://www.tetsudo.com/report/481/",
      "publisher": "鉄道コム（栗原景）",
      "lang": "ja",
      "date": "2025-01-26",
      "page": null,
      "checked": "2026-11-07"
    }
  ],
  "detail": "低い先端と運転台の間に張り出しがあります。",
  "technical": {
    "record": [
      [
        "923 type · JR West T5",
        "923形 · JR西日本T5編成"
      ],
      [
        [
          "formation",
          "7 cars",
          "7両",
          "t5"
        ],
        [
          "base",
          "700 series",
          "700系",
          "t5"
        ],
        [
          "built",
          "2005",
          "2005",
          "t5"
        ],
        [
          "inspection_speed",
          "270 km/h",
          "270 km/h",
          "t5"
        ]
      ]
    ],
    "sources": {
      "zero": [
        "日本車輌製造",
        "0系新幹線の主要諸元",
        "https://www.n-sharyo.co.jp/museum/tec0/tec0-spec.html",
        null,
        "主要諸元・2両ユニット"
      ],
      "history": [
        "日本車輌製造",
        "新幹線の変遷",
        "https://www.n-sharyo.co.jp/business/tetsudo/shinkansen/tec-mechanism.html",
        null,
        "車体材質・台車・制御装置"
      ],
      "300": [
        "日本車輌製造",
        "300系新幹線",
        "https://www.n-sharyo.co.jp/business/tetsudo/pages/jrc300.htm",
        null,
        "交流電動機・アルミ車体"
      ],
      "500": [
        "日本車輌製造",
        "JR西日本500系新幹線",
        "https://www.n-sharyo.co.jp/business/tetsudo/pages/jrw500.htm",
        null,
        "先頭長15 m・アルミハニカム車体"
      ],
      "700": [
        "日本車輌製造",
        "JR東海700系新幹線",
        "https://www.n-sharyo.co.jp/business/tetsudo/pages/jrc700.htm",
        null,
        "アルミ中空形材・区間別速度"
      ],
      "hitachi": [
        "日立製作所",
        "新型高速新幹線電車",
        "https://www.hitachihyoron.com/jp/pdf/1997/02/1997_02_02.pdf",
        "1997-02",
        "表1・冊子154頁"
      ],
      "n700": [
        "JR東海",
        "N700系・N700A 車両のご案内",
        "https://railway.jr-central.co.jp/train/shinkansen/detail_01_01/index.html",
        null,
        "諸元"
      ],
      "n700early": [
        "日本車輌製造",
        "JR東海N700系新幹線",
        "https://www.n-sharyo.co.jp/business/tetsudo/pages/jrcn700.htm",
        null,
        "開発時の主要諸元"
      ],
      "n700s": [
        "JR東海",
        "N700S 車両のご案内",
        "https://railway.jr-central.co.jp/train/shinkansen/n700s/index.html",
        null,
        "諸元"
      ],
      "sic": [
        "JR東海",
        "N700Sに採用する新技術について",
        "https://jr-central.co.jp/news/release/_pdf/000035165.pdf",
        "2017-09-28",
        "SiC素子駆動システム"
      ],
      "battery": [
        "JR東海",
        "N700S量産車の仕様および投入計画",
        "https://jr-central.co.jp/news/release/_pdf/000039300.pdf",
        "2019-01-25",
        "別紙4・バッテリ自走"
      ],
      "t3": [
        "JR西日本・白山市",
        "トレインパーク白山でのドクターイエロー（T3編成）の車両展示",
        "https://www.westjr.co.jp/press/article/items/250130_00_DoctorYellowT3inHakusantrainpark.pdf",
        "2025-01-30",
        "1頁"
      ],
      "t5": [
        "JR西日本",
        "ワタシたちの解体新書 ドクターイエロー",
        "https://www.jr-odekake.net/navi/the_last_run/project-t5/",
        null,
        "T5編成 基本DATA"
      ],
      "alfa": [
        "JR東日本",
        "JR EAST Technical Review No.65",
        "https://www.jreast.co.jp/development/tech/pdf_65/tech-65-05-15.pdf",
        "2020",
        "冊子9頁・ALFA-X主要諸元"
      ]
    }
  },
  "engineering": {
    "record": {
      "scope": {
        "en": "923 inspection work; T5 identity and JR Central-group track-measurement account",
        "ja": "923形の検測・T5の情報とJR東海グループの軌道検測解説"
      },
      "facts": [
        {
          "label": {
            "en": "Electrical measurements",
            "ja": "電気関係の検測"
          },
          "value": {
            "en": "Overhead equipment, ATC signals and train-radio reception",
            "ja": "架線設備・ATC信号・列車無線受信状態"
          },
          "sources": [
            "west:west-t5"
          ]
        },
        {
          "label": {
            "en": "Track data processing",
            "ja": "軌道データ処理"
          },
          "value": {
            "en": "Underfloor sensors; real-time on-board waveform display",
            "ja": "床下センサー・車上でリアルタイム波形表示"
          },
          "sources": [
            "west:west-trackinspection"
          ]
        },
        {
          "label": {
            "en": "Maintenance handoff",
            "ja": "保線へのデータ受け渡し"
          },
          "value": {
            "en": "Urgent findings relayed immediately; routine data sent by that evening",
            "ja": "緊急情報は即時連絡・検測データは当日夕方に送信"
          },
          "sources": [
            "west:west-trackinspection"
          ]
        }
      ],
      "insights": [
        {
          "title": {
            "en": "A moving measurement laboratory",
            "ja": "走る測定室"
          },
          "text": {
            "en": "The purpose is to turn a high-speed run into maintenance decisions. Sensor readings are processed aboard, and track crews use the results to locate poor geometry and compare conditions before and after work.",
            "ja": "高速走行を保守判断につなぐ車両。センサー値を車上で処理し、保線側では線形の悪い箇所の把握や作業前後の状態確認に使う。"
          },
          "sources": [
            "west:west-trackinspection"
          ]
        }
      ],
      "gaps": [
        "This operational account does not establish sensor sampling rate, resolution or a common traction specification for T4 and T5."
      ]
    },
    "sources": {
      "west:west-t5": {
        "title": "ワタシたちの解体新書 ドクターイエロー",
        "publisher": "JR西日本",
        "url": "https://www.jr-odekake.net/navi/the_last_run/project-t5/",
        "date": null,
        "language": "ja",
        "locator": "T5 basic data and description of measurement targets",
        "checked": "2026-11-07"
      },
      "west:west-trackinspection": {
        "title": "ドクターイエロー｜線路の状態を診る",
        "publisher": "日本機械保線（JR東海グループ）",
        "url": "https://www.nkh-cjrg.co.jp/business/examine/dr-yellow/",
        "date": null,
        "language": "ja",
        "locator": "270km/hの高速走行で検測・ドクターイエロー検測室では",
        "checked": "2026-11-07"
      }
    },
    "checked": "2026-11-07"
  },
  "literature": []
}