diff --git a/lib/eachTrainInfoCoreLib/searchSpecialTrain.js b/lib/eachTrainInfoCoreLib/searchSpecialTrain.js
index ec0e53d..39804cf 100644
--- a/lib/eachTrainInfoCoreLib/searchSpecialTrain.js
+++ b/lib/eachTrainInfoCoreLib/searchSpecialTrain.js
@@ -10,4 +10,17 @@ export const searchSpecialTrain = (trainNum, trainList) => {
   };
   if (search("D")) return searchBase + "D";
   if (search("M")) return searchBase + "M";
+
+  //増結いしづちの場合
+  const baseStr = trainNum
+    .replace("D", "")
+    .replace("M", "")
+    .replace("S", "")
+    .replace("X", "");
+  const baseNum = parseInt(baseStr);
+  if (9000 < baseNum && baseNum < 9047) {
+    //いしづちの1001M-1046Mが9000番台になっている場合に発動
+    const TD = trainList[`${baseNum - 8000}M`];
+    if (TD) return `${baseNum - 8000}M`;
+  }
 };